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 /* Copy of argument vector to toplev_main. */
130 static const char **save_argv
;
132 /* Name of top-level original source file (what was input to cpp).
133 This comes from the #-command at the beginning of the actual input.
134 If there isn't any there, then this is the cc1 input file name. */
136 const char *main_input_filename
;
138 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
139 to optimize in process_options (). */
140 #define AUTODETECT_VALUE 2
142 /* Name to use as base of names for dump output files. */
144 const char *dump_base_name
;
146 /* Directory used for dump output files. */
148 const char *dump_dir_name
;
150 /* Name to use as a base for auxiliary output files. */
152 const char *aux_base_name
;
154 /* Prefix for profile data files */
155 const char *profile_data_prefix
;
157 /* A mask of target_flags that includes bit X if X was set or cleared
158 on the command line. */
160 int target_flags_explicit
;
162 /* Debug hooks - dependent upon command line options. */
164 const struct gcc_debug_hooks
*debug_hooks
;
166 /* Other flags saying which kinds of debugging dump have been requested. */
168 int rtl_dump_and_exit
;
169 int flag_print_asm_name
;
170 enum graph_dump_types graph_dump_format
;
172 /* Name for output file of assembly code, specified with -o. */
174 const char *asm_file_name
;
176 /* Nonzero means do optimizations. -O.
177 Particular numeric values stand for particular amounts of optimization;
178 thus, -O2 stores 2 here. However, the optimizations beyond the basic
179 ones are not controlled directly by this variable. Instead, they are
180 controlled by individual `flag_...' variables that are defaulted
181 based on this variable. */
185 /* Nonzero means optimize for size. -Os.
186 The only valid values are zero and nonzero. When optimize_size is
187 nonzero, optimize defaults to 2, but certain individual code
188 bloating optimizations are disabled. */
190 int optimize_size
= 0;
192 /* True if this is the lto front end. This is used to disable
193 gimple generation and lowering passes that are normally run on the
194 output of a front end. These passes must be bypassed for lto since
195 they have already been done before the gimple was written. */
197 bool in_lto_p
= false;
199 /* Nonzero if we should write GIMPLE bytecode for link-time optimization. */
201 int flag_generate_lto
;
203 /* The FUNCTION_DECL for the function currently being compiled,
204 or 0 if between functions. */
205 tree current_function_decl
;
207 /* Set to the FUNC_BEGIN label of the current function, or NULL
209 const char * current_function_func_begin_label
;
211 /* Nonzero means to collect statistics which might be expensive
212 and to print them when we are done. */
213 int flag_detailed_statistics
= 0;
215 /* A random sequence of characters, unless overridden by user. */
216 static const char *flag_random_seed
;
218 /* A local time stamp derived from the time of compilation. It will be
219 zero if the system cannot provide a time. It will be -1u, if the
220 user has specified a particular random seed. */
225 /* Nonzero means `char' should be signed. */
227 int flag_signed_char
;
229 /* Nonzero means give an enum type only as many bytes as it needs. A value
230 of 2 means it has not yet been initialized. */
232 int flag_short_enums
;
234 /* Nonzero if structures and unions should be returned in memory.
236 This should only be defined if compatibility with another compiler or
237 with an ABI is needed, because it results in slower code. */
239 #ifndef DEFAULT_PCC_STRUCT_RETURN
240 #define DEFAULT_PCC_STRUCT_RETURN 1
243 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
245 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
247 /* 0 means straightforward implementation of complex divide acceptable.
248 1 means wide ranges of inputs must work for complex divide.
249 2 means C99-like requirements for complex multiply and divide. */
251 int flag_complex_method
= 1;
253 /* Nonzero means we should be saving declaration info into a .X file. */
255 int flag_gen_aux_info
= 0;
257 /* Specified name of aux-info file. */
259 const char *aux_info_file_name
;
261 /* Nonzero if we are compiling code for a shared library, zero for
266 /* Generate code for GNU or NeXT Objective-C runtime environment. */
268 #ifdef NEXT_OBJC_RUNTIME
269 int flag_next_runtime
= 1;
271 int flag_next_runtime
= 0;
274 /* Set to the default thread-local storage (tls) model to use. */
276 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
278 /* Set the default region and algorithm for the integrated register
281 enum ira_algorithm flag_ira_algorithm
= IRA_ALGORITHM_CB
;
282 enum ira_region flag_ira_region
= IRA_REGION_MIXED
;
284 /* Set the default value for -fira-verbose. */
286 unsigned int flag_ira_verbose
= 5;
288 /* Set the default for excess precision. */
290 enum excess_precision flag_excess_precision_cmdline
= EXCESS_PRECISION_DEFAULT
;
291 enum excess_precision flag_excess_precision
= EXCESS_PRECISION_DEFAULT
;
293 /* Nonzero means change certain warnings into errors.
294 Usually these are warnings about failure to conform to some standard. */
296 int flag_pedantic_errors
= 0;
298 /* Nonzero means make permerror produce warnings instead of errors. */
300 int flag_permissive
= 0;
302 /* -dA causes debug commentary information to be produced in
303 the generated assembly code (to make it more readable). This option
304 is generally only of use to those who actually need to read the
305 generated assembly code (perhaps while debugging the compiler itself).
306 Currently, this switch is only used by dwarfout.c; however, it is intended
307 to be a catchall for printing debug information in the assembler file. */
309 int flag_debug_asm
= 0;
311 /* -dP causes the rtl to be emitted as a comment in assembly. */
313 int flag_dump_rtl_in_asm
= 0;
315 /* When non-NULL, indicates that whenever space is allocated on the
316 stack, the resulting stack pointer must not pass this
317 address---that is, for stacks that grow downward, the stack pointer
318 must always be greater than or equal to this address; for stacks
319 that grow upward, the stack pointer must be less than this address.
320 At present, the rtx may be either a REG or a SYMBOL_REF, although
321 the support provided depends on the backend. */
324 /* Positive if we should track variables, negative if we should run
325 the var-tracking pass only to discard debug annotations, zero if
326 we're not to run it. When flag_var_tracking == AUTODETECT_VALUE it
327 will be set according to optimize, debug_info_level and debug_hooks
328 in process_options (). */
329 int flag_var_tracking
= AUTODETECT_VALUE
;
331 /* Positive if we should track variables at assignments, negative if
332 we should run the var-tracking pass only to discard debug
333 annotations. When flag_var_tracking_assignments ==
334 AUTODETECT_VALUE it will be set according to flag_var_tracking. */
335 int flag_var_tracking_assignments
= AUTODETECT_VALUE
;
337 /* Nonzero if we should toggle flag_var_tracking_assignments after
338 processing options and computing its default. */
339 int flag_var_tracking_assignments_toggle
= 0;
341 /* Type of stack check. */
342 enum stack_check_type flag_stack_check
= NO_STACK_CHECK
;
344 /* True if the user has tagged the function with the 'section'
347 bool user_defined_section_attribute
= false;
349 /* Values of the -falign-* flags: how much to align labels in code.
350 0 means `use default', 1 means `don't align'.
351 For each variable, there is an _log variant which is the power
352 of two not less than the variable, for .align output. */
355 int align_loops_max_skip
;
357 int align_jumps_max_skip
;
358 int align_labels_log
;
359 int align_labels_max_skip
;
360 int align_functions_log
;
364 const char *const string
;
368 lang_independent_options
;
370 /* Nonzero if subexpressions must be evaluated from left-to-right. */
371 int flag_evaluation_order
= 0;
373 /* The user symbol prefix after having resolved same. */
374 const char *user_label_prefix
;
376 static const param_info lang_independent_params
[] = {
377 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
378 { OPTION, DEFAULT, false, MIN, MAX, HELP },
379 #include "params.def"
381 { NULL
, 0, false, 0, 0, NULL
}
384 /* Output files for assembler code (real compiler output)
385 and debugging dumps. */
389 FILE *dump_file
= NULL
;
390 const char *dump_file_name
;
392 /* The current working directory of a translation. It's generally the
393 directory from which compilation was initiated, but a preprocessed
394 file may specify the original directory in which it was
397 static const char *src_pwd
;
399 /* Initialize src_pwd with the given string, and return true. If it
400 was already initialized, return false. As a special case, it may
401 be called with a NULL argument to test whether src_pwd has NOT been
405 set_src_pwd (const char *pwd
)
409 if (strcmp (src_pwd
, pwd
) == 0)
415 src_pwd
= xstrdup (pwd
);
419 /* Return the directory from which the translation unit was initiated,
420 in case set_src_pwd() was not called before to assign it a
436 /* Called when the start of a function definition is parsed,
437 this function prints on stderr the name of the function. */
439 announce_function (tree decl
)
443 if (rtl_dump_and_exit
)
444 fprintf (stderr
, "%s ",
445 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
447 fprintf (stderr
, " %s",
448 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
450 pp_needs_newline (global_dc
->printer
) = true;
451 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
455 /* Initialize local_tick with the time of day, or -1 if
456 flag_random_seed is set. */
459 init_local_tick (void)
461 if (!flag_random_seed
)
463 /* Get some more or less random data. */
464 #ifdef HAVE_GETTIMEOFDAY
468 gettimeofday (&tv
, NULL
);
469 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
473 time_t now
= time (NULL
);
475 if (now
!= (time_t)-1)
476 local_tick
= (unsigned) now
;
484 /* Set up a default flag_random_seed and local_tick, unless the user
485 already specified one. Must be called after init_local_tick. */
488 init_random_seed (void)
490 unsigned HOST_WIDE_INT value
;
491 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
493 value
= local_tick
^ getpid ();
495 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
496 flag_random_seed
= random_seed
;
499 /* Obtain the random_seed string. Unless NOINIT, initialize it if
500 it's not provided in the command line. */
503 get_random_seed (bool noinit
)
505 if (!flag_random_seed
&& !noinit
)
507 return flag_random_seed
;
510 /* Modify the random_seed string to VAL. Return its previous
514 set_random_seed (const char *val
)
516 const char *old
= flag_random_seed
;
517 flag_random_seed
= val
;
521 /* Decode the string P as an integral parameter.
522 If the string is indeed an integer return its numeric value else
523 issue an Invalid Option error for the option PNAME and return DEFVAL.
524 If PNAME is zero just return DEFVAL, do not call error. */
527 read_integral_parameter (const char *p
, const char *pname
, const int defval
)
529 const char *endp
= p
;
542 error ("invalid option argument %qs", pname
);
549 #if GCC_VERSION < 3004
551 /* The functions floor_log2 and exact_log2 are defined as inline
552 functions in toplev.h if GCC_VERSION >= 3004. The definitions here
553 are used for older versions of gcc. */
555 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
556 If X is 0, return -1. */
559 floor_log2 (unsigned HOST_WIDE_INT x
)
566 if (HOST_BITS_PER_WIDE_INT
> 64)
567 if (x
>= (unsigned HOST_WIDE_INT
) 1 << (t
+ 64))
569 if (HOST_BITS_PER_WIDE_INT
> 32)
570 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 32))
572 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 16))
574 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 8))
576 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 4))
578 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 2))
580 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 1))
586 /* Return the logarithm of X, base 2, considering X unsigned,
587 if X is a power of 2. Otherwise, returns -1. */
590 exact_log2 (unsigned HOST_WIDE_INT x
)
594 return floor_log2 (x
);
597 #endif /* GCC_VERSION < 3004 */
599 /* Handler for fatal signals, such as SIGSEGV. These are transformed
600 into ICE messages, which is much more user friendly. In case the
601 error printer crashes, reset the signal to prevent infinite recursion. */
604 crash_signal (int signo
)
606 signal (signo
, SIG_DFL
);
608 /* If we crashed while processing an ASM statement, then be a little more
609 graceful. It's most likely the user's fault. */
610 if (this_is_asm_operands
)
612 output_operand_lossage ("unrecoverable error");
613 exit (FATAL_EXIT_CODE
);
616 internal_error ("%s", strsignal (signo
));
619 /* Arrange to dump core on error. (The regular error message is still
620 printed first, except in the case of abort().) */
623 setup_core_dumping (void)
626 signal (SIGABRT
, SIG_DFL
);
628 #if defined(HAVE_SETRLIMIT)
631 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
632 fatal_error ("getting core file size maximum limit: %m");
633 rlim
.rlim_cur
= rlim
.rlim_max
;
634 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
635 fatal_error ("setting core file size limit to maximum: %m");
638 diagnostic_abort_on_error (global_dc
);
642 /* Strip off a legitimate source ending from the input string NAME of
643 length LEN. Rather than having to know the names used by all of
644 our front ends, we strip off an ending of a period followed by
645 up to five characters. (Java uses ".class".) */
648 strip_off_ending (char *name
, int len
)
651 for (i
= 2; i
< 6 && len
> i
; i
++)
653 if (name
[len
- i
] == '.')
655 name
[len
- i
] = '\0';
661 /* Output a quoted string. */
664 output_quoted_string (FILE *asm_file
, const char *string
)
666 #ifdef OUTPUT_QUOTED_STRING
667 OUTPUT_QUOTED_STRING (asm_file
, string
);
671 putc ('\"', asm_file
);
672 while ((c
= *string
++) != 0)
676 if (c
== '\"' || c
== '\\')
677 putc ('\\', asm_file
);
681 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
683 putc ('\"', asm_file
);
687 /* Output a file name in the form wanted by System V. */
690 output_file_directive (FILE *asm_file
, const char *input_name
)
695 if (input_name
== NULL
)
696 input_name
= "<stdin>";
698 input_name
= remap_debug_filename (input_name
);
700 len
= strlen (input_name
);
701 na
= input_name
+ len
;
703 /* NA gets INPUT_NAME sans directory names. */
704 while (na
> input_name
)
706 if (IS_DIR_SEPARATOR (na
[-1]))
711 #ifdef ASM_OUTPUT_SOURCE_FILENAME
712 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
714 fprintf (asm_file
, "\t.file\t");
715 output_quoted_string (asm_file
, na
);
716 putc ('\n', asm_file
);
720 /* A subroutine of wrapup_global_declarations. We've come to the end of
721 the compilation unit. All deferred variables should be undeferred,
722 and all incomplete decls should be finalized. */
725 wrapup_global_declaration_1 (tree decl
)
727 /* We're not deferring this any longer. Assignment is conditional to
728 avoid needlessly dirtying PCH pages. */
729 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
730 && DECL_DEFER_OUTPUT (decl
) != 0)
731 DECL_DEFER_OUTPUT (decl
) = 0;
733 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
734 lang_hooks
.finish_incomplete_decl (decl
);
737 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
738 needs to be output. Return true if it is output. */
741 wrapup_global_declaration_2 (tree decl
)
743 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
746 /* Don't write out static consts, unless we still need them.
748 We also keep static consts if not optimizing (for debugging),
749 unless the user specified -fno-keep-static-consts.
750 ??? They might be better written into the debug information.
751 This is possible when using DWARF.
753 A language processor that wants static constants to be always
754 written out (even if it is not used) is responsible for
755 calling rest_of_decl_compilation itself. E.g. the C front-end
756 calls rest_of_decl_compilation from finish_decl.
757 One motivation for this is that is conventional in some
758 environments to write things like:
759 static const char rcsid[] = "... version string ...";
760 intending to force the string to be in the executable.
762 A language processor that would prefer to have unneeded
763 static constants "optimized away" would just defer writing
764 them out until here. E.g. C++ does this, because static
765 constants are often defined in header files.
767 ??? A tempting alternative (for both C and C++) would be
768 to force a constant to be written if and only if it is
769 defined in a main file, as opposed to an include file. */
771 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
773 struct varpool_node
*node
;
775 node
= varpool_get_node (decl
);
777 if (!node
&& flag_ltrans
)
779 else if (node
&& node
->finalized
)
781 else if (node
&& node
->alias
)
783 else if (!cgraph_global_info_ready
785 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
787 else if (node
&& node
->needed
)
789 else if (DECL_COMDAT (decl
))
791 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
792 && (optimize
|| !flag_keep_static_consts
793 || DECL_ARTIFICIAL (decl
)))
798 rest_of_decl_compilation (decl
, 1, 1);
806 /* Do any final processing required for the declarations in VEC, of
807 which there are LEN. We write out inline functions and variables
808 that have been deferred until this point, but which are required.
809 Returns nonzero if anything was put out. */
812 wrapup_global_declarations (tree
*vec
, int len
)
814 bool reconsider
, output_something
= false;
817 for (i
= 0; i
< len
; i
++)
818 wrapup_global_declaration_1 (vec
[i
]);
820 /* Now emit any global variables or functions that we have been
821 putting off. We need to loop in case one of the things emitted
822 here references another one which comes earlier in the list. */
826 for (i
= 0; i
< len
; i
++)
827 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
829 output_something
= true;
833 return output_something
;
836 /* A subroutine of check_global_declarations. Issue appropriate warnings
837 for the global declaration DECL. */
840 check_global_declaration_1 (tree decl
)
842 /* Warn about any function declared static but not defined. We don't
843 warn about variables, because many programs have static variables
844 that exist only to get some text into the object file. */
845 if (TREE_CODE (decl
) == FUNCTION_DECL
846 && DECL_INITIAL (decl
) == 0
847 && DECL_EXTERNAL (decl
)
848 && ! DECL_ARTIFICIAL (decl
)
849 && ! TREE_NO_WARNING (decl
)
850 && ! TREE_PUBLIC (decl
)
851 && (warn_unused_function
852 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
854 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
855 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
857 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
858 /* This symbol is effectively an "extern" declaration now. */
859 TREE_PUBLIC (decl
) = 1;
860 assemble_external (decl
);
863 /* Warn about static fns or vars defined but not used. */
864 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
865 /* We don't warn about "static const" variables because the
866 "rcs_id" idiom uses that construction. */
867 || (warn_unused_variable
868 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
869 && ! DECL_IN_SYSTEM_HEADER (decl
)
870 && ! TREE_USED (decl
)
871 /* The TREE_USED bit for file-scope decls is kept in the identifier,
872 to handle multiple external decls in different scopes. */
873 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
874 && ! DECL_EXTERNAL (decl
)
875 && ! TREE_PUBLIC (decl
)
876 /* A volatile variable might be used in some non-obvious way. */
877 && ! TREE_THIS_VOLATILE (decl
)
878 /* Global register variables must be declared to reserve them. */
879 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
880 /* Otherwise, ask the language. */
881 && lang_hooks
.decls
.warn_unused_global (decl
))
882 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
883 ? OPT_Wunused_function
884 : OPT_Wunused_variable
,
885 "%q+D defined but not used", decl
);
888 /* Issue appropriate warnings for the global declarations in VEC (of
889 which there are LEN). */
892 check_global_declarations (tree
*vec
, int len
)
896 for (i
= 0; i
< len
; i
++)
897 check_global_declaration_1 (vec
[i
]);
900 /* Emit debugging information for all global declarations in VEC. */
903 emit_debug_global_declarations (tree
*vec
, int len
)
907 /* Avoid confusing the debug information machinery when there are errors. */
911 timevar_push (TV_SYMOUT
);
912 for (i
= 0; i
< len
; i
++)
913 debug_hooks
->global_decl (vec
[i
]);
914 timevar_pop (TV_SYMOUT
);
917 /* Warn about a use of an identifier which was marked deprecated. */
919 warn_deprecated_use (tree node
, tree attr
)
923 if (node
== 0 || !warn_deprecated_decl
)
929 attr
= DECL_ATTRIBUTES (node
);
930 else if (TYPE_P (node
))
932 tree decl
= TYPE_STUB_DECL (node
);
934 attr
= lookup_attribute ("deprecated",
935 TYPE_ATTRIBUTES (TREE_TYPE (decl
)));
940 attr
= lookup_attribute ("deprecated", attr
);
943 msg
= TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr
)));
949 expanded_location xloc
= expand_location (DECL_SOURCE_LOCATION (node
));
951 warning (OPT_Wdeprecated_declarations
,
952 "%qD is deprecated (declared at %s:%d): %s",
953 node
, xloc
.file
, xloc
.line
, msg
);
955 warning (OPT_Wdeprecated_declarations
,
956 "%qD is deprecated (declared at %s:%d)",
957 node
, xloc
.file
, xloc
.line
);
959 else if (TYPE_P (node
))
961 tree what
= NULL_TREE
;
962 tree decl
= TYPE_STUB_DECL (node
);
964 if (TYPE_NAME (node
))
966 if (TREE_CODE (TYPE_NAME (node
)) == IDENTIFIER_NODE
)
967 what
= TYPE_NAME (node
);
968 else if (TREE_CODE (TYPE_NAME (node
)) == TYPE_DECL
969 && DECL_NAME (TYPE_NAME (node
)))
970 what
= DECL_NAME (TYPE_NAME (node
));
975 expanded_location xloc
976 = expand_location (DECL_SOURCE_LOCATION (decl
));
980 warning (OPT_Wdeprecated_declarations
,
981 "%qE is deprecated (declared at %s:%d): %s",
982 what
, xloc
.file
, xloc
.line
, msg
);
984 warning (OPT_Wdeprecated_declarations
,
985 "%qE is deprecated (declared at %s:%d)", what
,
986 xloc
.file
, xloc
.line
);
991 warning (OPT_Wdeprecated_declarations
,
992 "type is deprecated (declared at %s:%d): %s",
993 xloc
.file
, xloc
.line
, msg
);
995 warning (OPT_Wdeprecated_declarations
,
996 "type is deprecated (declared at %s:%d)",
997 xloc
.file
, xloc
.line
);
1005 warning (OPT_Wdeprecated_declarations
, "%qE is deprecated: %s",
1008 warning (OPT_Wdeprecated_declarations
, "%qE is deprecated", what
);
1013 warning (OPT_Wdeprecated_declarations
, "type is deprecated: %s",
1016 warning (OPT_Wdeprecated_declarations
, "type is deprecated");
1022 /* Compile an entire translation unit. Write a file of assembly
1023 output and various debugging dumps. */
1028 /* Initialize yet another pass. */
1030 ggc_protect_identifiers
= true;
1033 init_final (main_input_filename
);
1034 coverage_init (aux_base_name
);
1036 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1038 timevar_push (TV_PARSE
);
1040 /* Call the parser, which parses the entire file (calling
1041 rest_of_compilation for each function). */
1042 lang_hooks
.parse_file (set_yydebug
);
1044 /* Compilation is now finished except for writing
1045 what's left of the symbol table output. */
1046 timevar_pop (TV_PARSE
);
1048 if (flag_syntax_only
|| flag_wpa
)
1051 ggc_protect_identifiers
= false;
1053 /* This must also call cgraph_finalize_compilation_unit. */
1054 lang_hooks
.decls
.final_write_globals ();
1059 /* Ensure that emulated TLS control vars are finalized and build
1060 a static constructor for them, when it is required. */
1061 if (!targetm
.have_tls
)
1064 varpool_assemble_pending_decls ();
1065 finish_aliases_2 ();
1067 /* Likewise for mudflap static object registrations. */
1069 mudflap_finish_file ();
1071 output_shared_constant_pool ();
1072 output_object_blocks ();
1074 /* Write out any pending weak symbol declarations. */
1077 /* This must be at the end before unwind and debug info.
1078 Some target ports emit PIC setup thunks here. */
1079 targetm
.asm_out
.code_end ();
1081 /* Do dbx symbols. */
1082 timevar_push (TV_SYMOUT
);
1084 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1085 if (dwarf2out_do_frame ())
1086 dwarf2out_frame_finish ();
1089 (*debug_hooks
->finish
) (main_input_filename
);
1090 timevar_pop (TV_SYMOUT
);
1092 /* Output some stuff at end of file if nec. */
1094 dw2_output_indirect_constants ();
1096 /* Flush any pending external directives. */
1097 process_pending_assemble_externals ();
1099 /* Emit LTO marker if LTO info has been previously emitted. This is
1100 used by collect2 to determine whether an object file contains IL.
1101 We used to emit an undefined reference here, but this produces
1102 link errors if an object file with IL is stored into a shared
1103 library without invoking lto1. */
1104 if (flag_generate_lto
)
1106 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1107 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
1109 (unsigned HOST_WIDE_INT
) 1, 8);
1110 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1111 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
1112 (unsigned HOST_WIDE_INT
) 1, 8);
1114 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
1115 (unsigned HOST_WIDE_INT
) 1,
1116 (unsigned HOST_WIDE_INT
) 1);
1120 /* Attach a special .ident directive to the end of the file to identify
1121 the version of GCC which compiled this code. The format of the .ident
1122 string is patterned after the ones produced by native SVR4 compilers. */
1126 const char *pkg_version
= "(GNU) ";
1128 if (strcmp ("(GCC) ", pkgversion_string
))
1129 pkg_version
= pkgversion_string
;
1130 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
1131 IDENT_ASM_OP
, pkg_version
, version_string
);
1135 /* Invoke registered plugin callbacks. */
1136 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
1138 /* This must be at the end. Some target ports emit end of file directives
1139 into the assembly file here, and hence we can not output anything to the
1140 assembly file after this point. */
1141 targetm
.asm_out
.file_end ();
1144 /* Parse a -d... command line switch. */
1147 decode_d_option (const char *arg
)
1158 flag_print_asm_name
= 1;
1161 flag_dump_rtl_in_asm
= 1;
1162 flag_print_asm_name
= 1;
1165 graph_dump_format
= vcg
;
1168 rtl_dump_and_exit
= 1;
1173 case 'D': /* These are handled by the preprocessor. */
1180 setup_core_dumping();
1183 enable_rtl_dump_file ();
1187 warning (0, "unrecognized gcc debugging option: %c", c
);
1192 /* Indexed by enum debug_info_type. */
1193 const char *const debug_type_names
[] =
1195 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1198 /* Print version information to FILE.
1199 Each line begins with INDENT (for the case where FILE is the
1200 assembler output file). */
1203 print_version (FILE *file
, const char *indent
)
1205 static const char fmt1
[] =
1207 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1209 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1212 static const char fmt2
[] =
1213 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1214 static const char fmt3
[] =
1215 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1216 static const char fmt4
[] =
1217 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1219 #define __VERSION__ "[?]"
1222 file
== stderr
? _(fmt1
) : fmt1
,
1223 indent
, *indent
!= 0 ? " " : "",
1224 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
1225 indent
, __VERSION__
);
1227 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1228 two string formats, "i.j.k" and "i.j" when k is zero. As of
1229 gmp-4.3.0, GMP always uses the 3 number format. */
1230 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1231 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1232 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1233 #define GCC_GMP_VERSION \
1234 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1235 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1236 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1237 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1239 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1240 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1241 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1244 file
== stderr
? _(fmt2
) : fmt2
,
1245 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
1246 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
1248 file
== stderr
? _(fmt3
) : fmt3
,
1249 indent
, *indent
!= 0 ? " " : "",
1250 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
1251 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
1253 file
== stderr
? _(fmt3
) : fmt3
,
1254 indent
, *indent
!= 0 ? " " : "",
1255 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
1256 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
1258 file
== stderr
? _(fmt3
) : fmt3
,
1259 indent
, *indent
!= 0 ? " " : "",
1260 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
1262 file
== stderr
? _(fmt4
) : fmt4
,
1263 indent
, *indent
!= 0 ? " " : "",
1264 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
1266 print_plugins_versions (file
, indent
);
1269 #ifdef ASM_COMMENT_START
1271 print_to_asm_out_file (print_switch_type type
, const char * text
)
1273 bool prepend_sep
= true;
1277 case SWITCH_TYPE_LINE_END
:
1278 putc ('\n', asm_out_file
);
1281 case SWITCH_TYPE_LINE_START
:
1282 fputs (ASM_COMMENT_START
, asm_out_file
);
1283 return strlen (ASM_COMMENT_START
);
1285 case SWITCH_TYPE_DESCRIPTIVE
:
1286 if (ASM_COMMENT_START
[0] == 0)
1287 prepend_sep
= false;
1289 case SWITCH_TYPE_PASSED
:
1290 case SWITCH_TYPE_ENABLED
:
1292 fputc (' ', asm_out_file
);
1293 fputs (text
, asm_out_file
);
1294 /* No need to return the length here as
1295 print_single_switch has already done it. */
1305 print_to_stderr (print_switch_type type
, const char * text
)
1309 case SWITCH_TYPE_LINE_END
:
1310 putc ('\n', stderr
);
1313 case SWITCH_TYPE_LINE_START
:
1316 case SWITCH_TYPE_PASSED
:
1317 case SWITCH_TYPE_ENABLED
:
1318 fputc (' ', stderr
);
1321 case SWITCH_TYPE_DESCRIPTIVE
:
1322 fputs (text
, stderr
);
1323 /* No need to return the length here as
1324 print_single_switch has already done it. */
1332 /* Print an option value and return the adjusted position in the line.
1333 ??? print_fn doesn't handle errors, eg disk full; presumably other
1334 code will catch a disk full though. */
1337 print_single_switch (print_switch_fn_type print_fn
,
1339 print_switch_type type
,
1342 /* The ultrix fprintf returns 0 on success, so compute the result
1343 we want here since we need it for the following test. The +1
1344 is for the separator character that will probably be emitted. */
1345 int len
= strlen (text
) + 1;
1348 && pos
+ len
> MAX_LINE
)
1350 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
1355 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
1357 print_fn (type
, text
);
1361 /* Print active target switches using PRINT_FN.
1362 POS is the current cursor position and MAX is the size of a "line".
1363 Each line begins with INDENT and ends with TERM.
1364 Each switch is separated from the next by SEP. */
1367 print_switch_values (print_switch_fn_type print_fn
)
1373 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1374 that it can be printed below. This helps reproducibility. */
1375 if (!flag_random_seed
)
1376 init_random_seed ();
1378 /* Print the options as passed. */
1379 pos
= print_single_switch (print_fn
, pos
,
1380 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
1382 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
1387 if (strcmp (*p
, "-o") == 0
1388 || strcmp (*p
, "-dumpbase") == 0
1389 || strcmp (*p
, "-dumpdir") == 0
1390 || strcmp (*p
, "-auxbase") == 0)
1397 if (strcmp (*p
, "-quiet") == 0
1398 || strcmp (*p
, "-version") == 0)
1405 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
, *p
);
1409 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
1411 /* Print the -f and -m options that have been enabled.
1412 We don't handle language specific options but printing argv
1414 pos
= print_single_switch (print_fn
, 0,
1415 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
1417 for (j
= 0; j
< cl_options_count
; j
++)
1418 if ((cl_options
[j
].flags
& CL_REPORT
)
1419 && option_enabled (j
) > 0)
1420 pos
= print_single_switch (print_fn
, pos
,
1421 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
1423 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
1426 /* Open assembly code output file. Do this even if -fsyntax-only is
1427 on, because then the driver will have provided the name of a
1428 temporary file or bit bucket for us. NAME is the file specified on
1429 the command line, possibly NULL. */
1431 init_asm_output (const char *name
)
1433 if (name
== NULL
&& asm_file_name
== 0)
1434 asm_out_file
= stdout
;
1437 if (asm_file_name
== 0)
1439 int len
= strlen (dump_base_name
);
1440 char *dumpname
= XNEWVEC (char, len
+ 6);
1442 memcpy (dumpname
, dump_base_name
, len
+ 1);
1443 strip_off_ending (dumpname
, len
);
1444 strcat (dumpname
, ".s");
1445 asm_file_name
= dumpname
;
1447 if (!strcmp (asm_file_name
, "-"))
1448 asm_out_file
= stdout
;
1450 asm_out_file
= fopen (asm_file_name
, "w+b");
1451 if (asm_out_file
== 0)
1452 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
1455 if (flag_graphite_read
&& flag_graphite_write
)
1456 fatal_error ("cannot read and write the Graphite representation at the same time");
1458 if (!flag_syntax_only
)
1460 targetm
.asm_out
.file_start ();
1462 if (flag_record_gcc_switches
)
1464 if (targetm
.asm_out
.record_gcc_switches
)
1466 /* Let the target know that we are about to start recording. */
1467 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
1469 /* Now record the switches. */
1470 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
1471 /* Let the target know that the recording is over. */
1472 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
1476 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
1479 #ifdef ASM_COMMENT_START
1480 if (flag_verbose_asm
)
1482 /* Print the list of switches in effect
1483 into the assembler file as comments. */
1484 print_version (asm_out_file
, ASM_COMMENT_START
);
1485 print_switch_values (print_to_asm_out_file
);
1486 putc ('\n', asm_out_file
);
1492 /* Return true if the state of option OPTION should be stored in PCH files
1493 and checked by default_pch_valid_p. Store the option's current state
1497 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1499 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1501 if (cl_options
[option
].flag_var
== &target_flags
)
1502 if (targetm
.check_pch_target_flags
)
1504 return get_option_state (option
, state
);
1507 /* Default version of get_pch_validity.
1508 By default, every flag difference is fatal; that will be mostly right for
1509 most targets, but completely right for very few. */
1512 default_get_pch_validity (size_t *sz
)
1514 struct cl_option_state state
;
1519 if (targetm
.check_pch_target_flags
)
1520 *sz
+= sizeof (target_flags
);
1521 for (i
= 0; i
< cl_options_count
; i
++)
1522 if (option_affects_pch_p (i
, &state
))
1525 result
= r
= XNEWVEC (char, *sz
);
1529 if (targetm
.check_pch_target_flags
)
1531 memcpy (r
, &target_flags
, sizeof (target_flags
));
1532 r
+= sizeof (target_flags
);
1535 for (i
= 0; i
< cl_options_count
; i
++)
1536 if (option_affects_pch_p (i
, &state
))
1538 memcpy (r
, state
.data
, state
.size
);
1545 /* Return a message which says that a PCH file was created with a different
1546 setting of OPTION. */
1549 pch_option_mismatch (const char *option
)
1553 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1555 return _("out of memory");
1559 /* Default version of pch_valid_p. */
1562 default_pch_valid_p (const void *data_p
, size_t len
)
1564 struct cl_option_state state
;
1565 const char *data
= (const char *)data_p
;
1568 /* -fpic and -fpie also usually make a PCH invalid. */
1569 if (data
[0] != flag_pic
)
1570 return _("created and used with different settings of -fpic");
1571 if (data
[1] != flag_pie
)
1572 return _("created and used with different settings of -fpie");
1575 /* Check target_flags. */
1576 if (targetm
.check_pch_target_flags
)
1581 memcpy (&tf
, data
, sizeof (target_flags
));
1582 data
+= sizeof (target_flags
);
1583 len
-= sizeof (target_flags
);
1584 r
= targetm
.check_pch_target_flags (tf
);
1589 for (i
= 0; i
< cl_options_count
; i
++)
1590 if (option_affects_pch_p (i
, &state
))
1592 if (memcmp (data
, state
.data
, state
.size
) != 0)
1593 return pch_option_mismatch (cl_options
[i
].opt_text
);
1601 /* Default tree printer. Handles declarations only. */
1603 default_tree_printer (pretty_printer
*pp
, text_info
*text
, const char *spec
,
1604 int precision
, bool wide
, bool set_locus
, bool hash
)
1608 /* FUTURE: %+x should set the locus. */
1609 if (precision
!= 0 || wide
|| hash
)
1615 t
= va_arg (*text
->args_ptr
, tree
);
1616 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
1618 pp_identifier (pp
, IDENTIFIER_POINTER (t
));
1624 t
= va_arg (*text
->args_ptr
, tree
);
1625 if (DECL_DEBUG_EXPR_IS_FROM (t
) && DECL_DEBUG_EXPR (t
))
1626 t
= DECL_DEBUG_EXPR (t
);
1631 t
= va_arg (*text
->args_ptr
, tree
);
1635 percent_K_format (text
);
1642 if (set_locus
&& text
->locus
)
1643 *text
->locus
= DECL_SOURCE_LOCATION (t
);
1647 const char *n
= DECL_NAME (t
)
1648 ? identifier_to_locale (lang_hooks
.decl_printable_name (t
, 2))
1653 dump_generic_node (pp
, t
, 0, TDF_DIAGNOSTIC
, 0);
1658 /* A helper function; used as the reallocator function for cpp's line
1661 realloc_for_line_map (void *ptr
, size_t len
)
1663 return ggc_realloc (ptr
, len
);
1666 /* A helper function: used as the allocator function for
1667 identifier_to_locale. */
1669 alloc_for_identifier_to_locale (size_t len
)
1671 return ggc_alloc (len
);
1674 /* Initialization of the front end environment, before command line
1675 options are parsed. Signal handlers, internationalization etc.
1676 ARGV0 is main's argv[0]. */
1678 general_init (const char *argv0
)
1682 p
= argv0
+ strlen (argv0
);
1683 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1687 xmalloc_set_program_name (progname
);
1691 /* Unlock the stdio streams. */
1692 unlock_std_streams ();
1694 gcc_init_libintl ();
1696 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1697 identifier_to_locale_free
= ggc_free
;
1699 /* Initialize the diagnostics reporting machinery, so option parsing
1700 can give warnings and errors. */
1701 diagnostic_initialize (global_dc
, N_OPTS
);
1702 diagnostic_starter (global_dc
) = default_tree_diagnostic_starter
;
1703 /* Set a default printer. Language specific initializations will
1704 override it later. */
1705 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
1706 global_dc
->show_option_requested
= flag_diagnostics_show_option
;
1707 global_dc
->show_column
= flag_show_column
;
1708 global_dc
->internal_error
= plugins_internal_error_function
;
1709 global_dc
->option_enabled
= option_enabled
;
1710 global_dc
->option_name
= option_name
;
1712 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1714 signal (SIGSEGV
, crash_signal
);
1717 signal (SIGILL
, crash_signal
);
1720 signal (SIGBUS
, crash_signal
);
1723 signal (SIGABRT
, crash_signal
);
1725 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1726 signal (SIGIOT
, crash_signal
);
1729 signal (SIGFPE
, crash_signal
);
1732 /* Other host-specific signal setup. */
1733 (*host_hooks
.extra_signals
)();
1735 /* Initialize the garbage-collector, string pools and tree type hash
1739 line_table
= GGC_NEW (struct line_maps
);
1740 linemap_init (line_table
);
1741 line_table
->reallocator
= realloc_for_line_map
;
1744 /* Initialize register usage now so switches may override. */
1747 /* Register the language-independent parameters. */
1748 add_params (lang_independent_params
, LAST_PARAM
);
1750 /* This must be done after add_params but before argument processing. */
1751 init_ggc_heuristics();
1752 init_optimization_passes ();
1753 statistics_early_init ();
1756 /* Return true if the current target supports -fsection-anchors. */
1759 target_supports_section_anchors_p (void)
1761 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1764 if (targetm
.asm_out
.output_anchor
== NULL
)
1770 /* Default the align_* variables to 1 if they're still unset, and
1771 set up the align_*_log variables. */
1773 init_alignments (void)
1775 if (align_loops
<= 0)
1777 if (align_loops_max_skip
> align_loops
)
1778 align_loops_max_skip
= align_loops
- 1;
1779 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1780 if (align_jumps
<= 0)
1782 if (align_jumps_max_skip
> align_jumps
)
1783 align_jumps_max_skip
= align_jumps
- 1;
1784 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1785 if (align_labels
<= 0)
1787 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1788 if (align_labels_max_skip
> align_labels
)
1789 align_labels_max_skip
= align_labels
- 1;
1790 if (align_functions
<= 0)
1791 align_functions
= 1;
1792 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1795 /* Process the options that have been parsed. */
1797 process_options (void)
1799 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1800 This can happen with incorrect pre-processed input. */
1801 debug_hooks
= &do_nothing_debug_hooks
;
1803 /* This replaces set_Wunused. */
1804 if (warn_unused_function
== -1)
1805 warn_unused_function
= warn_unused
;
1806 if (warn_unused_label
== -1)
1807 warn_unused_label
= warn_unused
;
1808 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1809 if (warn_unused_parameter
== -1)
1810 warn_unused_parameter
= (warn_unused
&& extra_warnings
);
1811 if (warn_unused_variable
== -1)
1812 warn_unused_variable
= warn_unused
;
1813 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1815 if (warn_unused_but_set_parameter
== -1)
1816 warn_unused_but_set_parameter
= (warn_unused
&& extra_warnings
);
1817 if (warn_unused_but_set_variable
== -1)
1818 warn_unused_but_set_variable
= warn_unused
;
1819 if (warn_unused_value
== -1)
1820 warn_unused_value
= warn_unused
;
1822 /* This replaces set_Wextra. */
1823 if (warn_uninitialized
== -1)
1824 warn_uninitialized
= extra_warnings
;
1826 /* Allow the front end to perform consistency checks and do further
1827 initialization based on the command line options. This hook also
1828 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1829 so we can correctly initialize debug output. */
1830 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1832 #ifdef OVERRIDE_OPTIONS
1833 /* Some machines may reject certain combinations of options. */
1837 /* Avoid any informative notes in the second run of -fcompare-debug. */
1838 if (flag_compare_debug
)
1839 diagnostic_inhibit_notes (global_dc
);
1841 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1843 warning (OPT_fsection_anchors
,
1844 "this target does not support %qs", "-fsection-anchors");
1845 flag_section_anchors
= 0;
1848 if (flag_short_enums
== 2)
1849 flag_short_enums
= targetm
.default_short_enums ();
1851 /* Set aux_base_name if not already set. */
1854 else if (main_input_filename
)
1856 char *name
= xstrdup (lbasename (main_input_filename
));
1858 strip_off_ending (name
, strlen (name
));
1859 aux_base_name
= name
;
1862 aux_base_name
= "gccaux";
1867 || flag_loop_interchange
1868 || flag_loop_strip_mine
1869 || flag_graphite_identity
1870 || flag_loop_parallelize_all
)
1871 sorry ("Graphite loop optimizations cannot be used");
1874 /* Disable graphite loop optimizations when -fgraphite-read is
1876 if (flag_graphite_read
)
1878 flag_loop_block
= 0;
1879 flag_loop_interchange
= 0;
1880 flag_loop_strip_mine
= 0;
1883 /* Unrolling all loops implies that standard loop unrolling must also
1885 if (flag_unroll_all_loops
)
1886 flag_unroll_loops
= 1;
1888 /* The loop unrolling code assumes that cse will be run after loop.
1889 web and rename-registers also help when run after loop unrolling. */
1890 if (flag_rerun_cse_after_loop
== AUTODETECT_VALUE
)
1891 flag_rerun_cse_after_loop
= flag_unroll_loops
|| flag_peel_loops
;
1893 if (flag_web
== AUTODETECT_VALUE
)
1894 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1896 if (flag_rename_registers
== AUTODETECT_VALUE
)
1897 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1899 if (flag_non_call_exceptions
)
1900 flag_asynchronous_unwind_tables
= 1;
1901 if (flag_asynchronous_unwind_tables
)
1902 flag_unwind_tables
= 1;
1904 if (flag_value_profile_transformations
)
1905 flag_profile_values
= 1;
1907 /* Warn about options that are not supported on this machine. */
1908 #ifndef INSN_SCHEDULING
1909 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1910 warning (0, "instruction scheduling not supported on this target machine");
1913 if (flag_delayed_branch
)
1914 warning (0, "this target machine does not have delayed branches");
1917 user_label_prefix
= USER_LABEL_PREFIX
;
1918 if (flag_leading_underscore
!= -1)
1920 /* If the default prefix is more complicated than "" or "_",
1921 issue a warning and ignore this option. */
1922 if (user_label_prefix
[0] == 0 ||
1923 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1925 user_label_prefix
= flag_leading_underscore
? "_" : "";
1928 warning (0, "-f%sleading-underscore not supported on this target machine",
1929 flag_leading_underscore
? "" : "no-");
1932 /* If we are in verbose mode, write out the version and maybe all the
1933 option flags in use. */
1936 print_version (stderr
, "");
1938 print_switch_values (print_to_stderr
);
1941 if (flag_syntax_only
)
1943 write_symbols
= NO_DEBUG
;
1949 if (debug_info_level
== DINFO_LEVEL_NONE
)
1951 debug_info_level
= DINFO_LEVEL_NORMAL
;
1953 if (write_symbols
== NO_DEBUG
)
1954 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1957 debug_info_level
= DINFO_LEVEL_NONE
;
1960 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1962 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1965 error ("could not open final insn dump file %qs: %m",
1966 flag_dump_final_insns
);
1967 flag_dump_final_insns
= NULL
;
1969 else if (fclose (final_output
))
1971 error ("could not close zeroed insn dump file %qs: %m",
1972 flag_dump_final_insns
);
1973 flag_dump_final_insns
= NULL
;
1977 /* Unless over-ridden for the target, assume that all DWARF levels
1978 may be emitted, if DWARF2_DEBUG is selected. */
1979 if (dwarf_strict
< 0)
1982 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1984 if (debug_info_level
== DINFO_LEVEL_NONE
)
1985 write_symbols
= NO_DEBUG
;
1987 if (write_symbols
== NO_DEBUG
)
1989 #if defined(DBX_DEBUGGING_INFO)
1990 else if (write_symbols
== DBX_DEBUG
)
1991 debug_hooks
= &dbx_debug_hooks
;
1993 #if defined(XCOFF_DEBUGGING_INFO)
1994 else if (write_symbols
== XCOFF_DEBUG
)
1995 debug_hooks
= &xcoff_debug_hooks
;
1997 #ifdef SDB_DEBUGGING_INFO
1998 else if (write_symbols
== SDB_DEBUG
)
1999 debug_hooks
= &sdb_debug_hooks
;
2001 #ifdef DWARF2_DEBUGGING_INFO
2002 else if (write_symbols
== DWARF2_DEBUG
)
2003 debug_hooks
= &dwarf2_debug_hooks
;
2005 #ifdef VMS_DEBUGGING_INFO
2006 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
2007 debug_hooks
= &vmsdbg_debug_hooks
;
2010 error ("target system does not support the \"%s\" debug format",
2011 debug_type_names
[write_symbols
]);
2013 /* We know which debug output will be used so we can set flag_var_tracking
2014 and flag_var_tracking_uninit if the user has not specified them. */
2015 if (debug_info_level
< DINFO_LEVEL_NORMAL
2016 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
2018 if (flag_var_tracking
== 1
2019 || flag_var_tracking_uninit
== 1)
2021 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
2022 warning (0, "variable tracking requested, but useless unless "
2023 "producing debug info");
2025 warning (0, "variable tracking requested, but not supported "
2026 "by this debug format");
2028 flag_var_tracking
= 0;
2029 flag_var_tracking_uninit
= 0;
2032 /* If the user specifically requested variable tracking with tagging
2033 uninitialized variables, we need to turn on variable tracking.
2034 (We already determined above that variable tracking is feasible.) */
2035 if (flag_var_tracking_uninit
)
2036 flag_var_tracking
= 1;
2038 if (flag_var_tracking
== AUTODETECT_VALUE
)
2039 flag_var_tracking
= optimize
>= 1;
2041 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
2042 flag_var_tracking_assignments
= flag_var_tracking
2043 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
2045 if (flag_var_tracking_assignments_toggle
)
2046 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
2048 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
2049 flag_var_tracking
= flag_var_tracking_assignments
= -1;
2051 if (flag_var_tracking_assignments
2052 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
2053 warning (0, "var-tracking-assignments changes selective scheduling");
2055 if (flag_tree_cselim
== AUTODETECT_VALUE
)
2056 #ifdef HAVE_conditional_move
2057 flag_tree_cselim
= 1;
2059 flag_tree_cselim
= 0;
2062 /* If auxiliary info generation is desired, open the output file.
2063 This goes in the same directory as the source file--unlike
2064 all the other output files. */
2065 if (flag_gen_aux_info
)
2067 aux_info_file
= fopen (aux_info_file_name
, "w");
2068 if (aux_info_file
== 0)
2069 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
2072 if (! targetm
.have_named_sections
)
2074 if (flag_function_sections
)
2076 warning (0, "-ffunction-sections not supported for this target");
2077 flag_function_sections
= 0;
2079 if (flag_data_sections
)
2081 warning (0, "-fdata-sections not supported for this target");
2082 flag_data_sections
= 0;
2086 if (flag_function_sections
&& profile_flag
)
2088 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
2089 flag_function_sections
= 0;
2092 #ifndef HAVE_prefetch
2093 if (flag_prefetch_loop_arrays
)
2095 warning (0, "-fprefetch-loop-arrays not supported for this target");
2096 flag_prefetch_loop_arrays
= 0;
2099 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
2101 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
2102 flag_prefetch_loop_arrays
= 0;
2106 /* This combination of options isn't handled for i386 targets and doesn't
2107 make much sense anyway, so don't allow it. */
2108 if (flag_prefetch_loop_arrays
&& optimize_size
)
2110 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
2111 flag_prefetch_loop_arrays
= 0;
2114 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2115 if (flag_signaling_nans
)
2116 flag_trapping_math
= 1;
2118 /* We cannot reassociate if we want traps or signed zeros. */
2119 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
2121 warning (0, "-fassociative-math disabled; other options take precedence");
2122 flag_associative_math
= 0;
2125 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2126 if (flag_cx_limited_range
)
2127 flag_complex_method
= 0;
2129 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2130 if (flag_cx_fortran_rules
)
2131 flag_complex_method
= 1;
2133 /* Targets must be able to place spill slots at lower addresses. If the
2134 target already uses a soft frame pointer, the transition is trivial. */
2135 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
2137 warning (0, "-fstack-protector not supported for this target");
2138 flag_stack_protect
= 0;
2140 if (!flag_stack_protect
)
2141 warn_stack_protect
= 0;
2143 /* ??? Unwind info is not correct around the CFG unless either a frame
2144 pointer is present or A_O_A is set. Fixing this requires rewriting
2145 unwind info generation to be aware of the CFG and propagating states
2147 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
2148 && flag_omit_frame_pointer
)
2150 warning (0, "unwind tables currently require a frame pointer "
2152 flag_omit_frame_pointer
= 0;
2155 /* Save the current optimization options. */
2156 optimization_default_node
= build_optimization_node ();
2157 optimization_current_node
= optimization_default_node
;
2160 /* This function can be called multiple times to reinitialize the compiler
2161 back end when register classes or instruction sets have changed,
2162 before each function. */
2164 backend_init_target (void)
2166 /* Initialize alignment variables. */
2169 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2170 to initialize reg_raw_mode[]. */
2173 /* This invokes target hooks to set fixed_reg[] etc, which is
2177 /* This depends on stack_pointer_rtx. */
2178 init_fake_stack_mems ();
2180 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2182 init_alias_target ();
2184 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2187 /* The following initialization functions need to generate rtl, so
2188 provide a dummy function context for them. */
2189 init_dummy_function_start ();
2191 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2192 on a mode change. */
2195 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2196 after a mode change as well. */
2197 caller_save_initialized_p
= false;
2199 expand_dummy_function_end ();
2202 /* Initialize the compiler back end. This function is called only once,
2203 when starting the compiler. */
2210 init_inline_once ();
2211 init_varasm_once ();
2212 save_register_info ();
2214 /* Initialize the target-specific back end pieces. */
2216 backend_init_target ();
2219 /* Initialize excess precision settings. */
2221 init_excess_precision (void)
2223 /* Adjust excess precision handling based on the target options. If
2224 the front end cannot handle it, flag_excess_precision_cmdline
2225 will already have been set accordingly in the post_options
2227 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
2228 flag_excess_precision
= flag_excess_precision_cmdline
;
2229 if (flag_unsafe_math_optimizations
)
2230 flag_excess_precision
= EXCESS_PRECISION_FAST
;
2231 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
2233 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
2234 switch (flt_eval_method
)
2238 /* Either the target acts unpredictably (-1) or has all the
2239 operations required not to have excess precision (0). */
2240 flag_excess_precision
= EXCESS_PRECISION_FAST
;
2244 /* In these cases, predictable excess precision makes
2248 /* Any other implementation-defined FLT_EVAL_METHOD values
2249 require the compiler to handle the associated excess
2250 precision rules in excess_precision_type. */
2256 /* Initialize things that are both lang-dependent and target-dependent.
2257 This function can be called more than once if target parameters change. */
2259 lang_dependent_init_target (void)
2261 /* This determines excess precision settings. */
2262 init_excess_precision ();
2264 /* This creates various _DECL nodes, so needs to be called after the
2265 front end is initialized. It also depends on the HAVE_xxx macros
2266 generated from the target machine description. */
2269 /* The following initialization functions need to generate rtl, so
2270 provide a dummy function context for them. */
2271 init_dummy_function_start ();
2273 /* Do the target-specific parts of expr initialization. */
2274 init_expr_target ();
2276 /* Although the actions of these functions are language-independent,
2277 they use optabs, so we cannot call them from backend_init. */
2281 expand_dummy_function_end ();
2284 /* Language-dependent initialization. Returns nonzero on success. */
2286 lang_dependent_init (const char *name
)
2288 location_t save_loc
= input_location
;
2289 if (dump_base_name
== 0)
2290 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
2292 /* Other front-end initialization. */
2293 input_location
= BUILTINS_LOCATION
;
2294 if (lang_hooks
.init () == 0)
2296 input_location
= save_loc
;
2298 init_asm_output (name
);
2300 /* This creates various _DECL nodes, so needs to be called after the
2301 front end is initialized. */
2304 /* Do the target-specific parts of the initialization. */
2305 lang_dependent_init_target ();
2307 /* If dbx symbol table desired, initialize writing it and output the
2308 predefined types. */
2309 timevar_push (TV_SYMOUT
);
2311 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2312 if (dwarf2out_do_frame ())
2313 dwarf2out_frame_init ();
2316 /* Now we have the correct original filename, we can initialize
2318 (*debug_hooks
->init
) (name
);
2320 timevar_pop (TV_SYMOUT
);
2326 /* Reinitialize everything when target parameters, such as register usage,
2329 target_reinit (void)
2331 /* Reinitialize RTL backend. */
2332 backend_init_target ();
2334 /* Reinitialize lang-dependent parts. */
2335 lang_dependent_init_target ();
2339 dump_memory_report (bool final
)
2341 ggc_print_statistics ();
2342 stringpool_statistics ();
2343 dump_tree_statistics ();
2344 dump_gimple_statistics ();
2345 dump_rtx_statistics ();
2346 dump_alloc_pool_statistics ();
2347 dump_bitmap_statistics ();
2348 dump_vec_loc_statistics ();
2349 dump_ggc_loc_statistics (final
);
2350 dump_alias_stats (stderr
);
2351 dump_pta_stats (stderr
);
2354 /* Clean up: close opened files, etc. */
2359 /* Close the dump files. */
2360 if (flag_gen_aux_info
)
2362 fclose (aux_info_file
);
2364 unlink (aux_info_file_name
);
2367 /* Close non-debugging input and output files. Take special care to note
2368 whether fclose returns an error, since the pages might still be on the
2369 buffer chain while the file is open. */
2373 if (ferror (asm_out_file
) != 0)
2374 fatal_error ("error writing to %s: %m", asm_file_name
);
2375 if (fclose (asm_out_file
) != 0)
2376 fatal_error ("error closing %s: %m", asm_file_name
);
2378 unlink_if_ordinary (asm_file_name
);
2382 finish_optimization_passes ();
2387 dump_memory_report (true);
2389 /* Language-specific end of compilation actions. */
2390 lang_hooks
.finish ();
2393 /* Initialize the compiler, and compile the input file. */
2397 /* Initialize timing first. The C front ends read the main file in
2398 the post_options hook, and C++ does file timings. */
2399 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
2401 timevar_start (TV_TOTAL
);
2405 /* Don't do any more if an error has already occurred. */
2408 /* This must be run always, because it is needed to compute the FP
2409 predefined macros, such as __LDBL_MAX__, for targets using non
2410 default FP formats. */
2411 init_adjust_machine_modes ();
2413 /* Set up the back-end if requested. */
2417 /* Language-dependent initialization. Returns true on success. */
2418 if (lang_dependent_init (main_input_filename
))
2424 /* Stop timing and print the times. */
2425 timevar_stop (TV_TOTAL
);
2426 timevar_print (stderr
);
2429 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2430 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2431 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2433 It is not safe to call this function more than once. */
2436 toplev_main (int argc
, char **argv
)
2438 expandargv (&argc
, &argv
);
2440 save_argv
= CONST_CAST2 (const char **, char **, argv
);
2442 /* Initialization of GCC's environment, and diagnostics. */
2443 general_init (argv
[0]);
2445 /* Parse the options and do minimal processing; basically just
2446 enough to default flags appropriately. */
2447 decode_options (argc
, CONST_CAST2 (const char **, char **, argv
));
2451 initialize_plugins ();
2454 print_version (stderr
, "");
2457 print_plugins_help (stderr
, "");
2459 /* Exit early if we can (e.g. -help). */
2460 if (!exit_after_options
)
2463 if (warningcount
|| errorcount
)
2464 print_ignored_options ();
2465 diagnostic_finish (global_dc
);
2467 /* Invoke registered plugin callbacks if any. */
2468 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2470 finalize_plugins ();
2472 return (FATAL_EXIT_CODE
);
2474 return (SUCCESS_EXIT_CODE
);