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 2011 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"
34 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
39 #include "insn-attr.h"
40 #include "insn-config.h"
41 #include "insn-flags.h"
42 #include "hard-reg-set.h"
49 #include "basic-block.h"
55 #include "diagnostic.h"
56 #include "tree-diagnostic.h"
57 #include "tree-pretty-print.h"
61 #include "dwarf2asm.h"
62 #include "integrate.h"
65 #include "common/common-target.h"
66 #include "langhooks.h"
67 #include "cfglayout.h"
69 #include "hosthooks.h"
72 #include "opts-diagnostic.h"
74 #include "value-prof.h"
75 #include "alloc-pool.h"
76 #include "tree-mudflap.h"
77 #include "tree-pass.h"
79 #include "tree-ssa-alias.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 static void general_init (const char *);
100 static void do_compile (void);
101 static void process_options (void);
102 static void backend_init (void);
103 static int lang_dependent_init (const char *);
104 static void init_asm_output (const char *);
105 static void finalize (bool);
107 static void crash_signal (int) ATTRIBUTE_NORETURN
;
108 static void compile_file (void);
110 /* True if we don't need a backend (e.g. preprocessing only). */
111 static bool no_backend
;
113 /* Length of line when printing switch values. */
116 /* Decoded options, and number of such options. */
117 struct cl_decoded_option
*save_decoded_options
;
118 unsigned int save_decoded_options_count
;
120 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
121 to optimize in process_options (). */
122 #define AUTODETECT_VALUE 2
124 /* Debug hooks - dependent upon command line options. */
126 const struct gcc_debug_hooks
*debug_hooks
;
128 /* The FUNCTION_DECL for the function currently being compiled,
129 or 0 if between functions. */
130 tree current_function_decl
;
132 /* Set to the FUNC_BEGIN label of the current function, or NULL
134 const char * current_function_func_begin_label
;
136 /* A random sequence of characters, unless overridden by user. */
137 static const char *flag_random_seed
;
139 /* A local time stamp derived from the time of compilation. It will be
140 zero if the system cannot provide a time. It will be -1u, if the
141 user has specified a particular random seed. */
144 /* Random number for this compilation */
145 HOST_WIDE_INT random_seed
;
149 /* Generate code for GNU or NeXT Objective-C runtime environment. */
151 #ifdef NEXT_OBJC_RUNTIME
152 int flag_next_runtime
= 1;
154 int flag_next_runtime
= 0;
157 /* Nonzero means make permerror produce warnings instead of errors. */
159 int flag_permissive
= 0;
161 /* When non-NULL, indicates that whenever space is allocated on the
162 stack, the resulting stack pointer must not pass this
163 address---that is, for stacks that grow downward, the stack pointer
164 must always be greater than or equal to this address; for stacks
165 that grow upward, the stack pointer must be less than this address.
166 At present, the rtx may be either a REG or a SYMBOL_REF, although
167 the support provided depends on the backend. */
170 /* True if the user has tagged the function with the 'section'
173 bool user_defined_section_attribute
= false;
175 struct target_flag_state default_target_flag_state
;
176 #if SWITCHABLE_TARGET
177 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
179 #define this_target_flag_state (&default_target_flag_state)
182 /* The user symbol prefix after having resolved same. */
183 const char *user_label_prefix
;
185 /* Output files for assembler code (real compiler output)
186 and debugging dumps. */
190 FILE *stack_usage_file
= NULL
;
191 FILE *dump_file
= NULL
;
192 const char *dump_file_name
;
194 /* The current working directory of a translation. It's generally the
195 directory from which compilation was initiated, but a preprocessed
196 file may specify the original directory in which it was
199 static const char *src_pwd
;
201 /* Initialize src_pwd with the given string, and return true. If it
202 was already initialized, return false. As a special case, it may
203 be called with a NULL argument to test whether src_pwd has NOT been
207 set_src_pwd (const char *pwd
)
211 if (strcmp (src_pwd
, pwd
) == 0)
217 src_pwd
= xstrdup (pwd
);
221 /* Return the directory from which the translation unit was initiated,
222 in case set_src_pwd() was not called before to assign it a
238 /* Called when the start of a function definition is parsed,
239 this function prints on stderr the name of the function. */
241 announce_function (tree decl
)
245 if (rtl_dump_and_exit
)
246 fprintf (stderr
, "%s ",
247 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
249 fprintf (stderr
, " %s",
250 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
252 pp_needs_newline (global_dc
->printer
) = true;
253 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
257 /* Initialize local_tick with a random number or -1 if
258 flag_random_seed is set. */
261 init_local_tick (void)
263 if (!flag_random_seed
)
265 /* Try urandom first. Time of day is too likely to collide.
266 In case of any error we just use the local tick. */
268 int fd
= open ("/dev/urandom", O_RDONLY
);
271 read (fd
, &random_seed
, sizeof (random_seed
));
275 /* Now get the tick anyways */
276 #ifdef HAVE_GETTIMEOFDAY
280 gettimeofday (&tv
, NULL
);
281 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
285 time_t now
= time (NULL
);
287 if (now
!= (time_t)-1)
288 local_tick
= (unsigned) now
;
296 /* Set up a default flag_random_seed and local_tick, unless the user
297 already specified one. Must be called after init_local_tick. */
300 init_random_seed (void)
302 if (flag_random_seed
)
306 /* When the driver passed in a hex number don't crc it again */
307 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
308 if (!(endp
> flag_random_seed
&& *endp
== 0))
309 random_seed
= crc32_string (0, flag_random_seed
);
311 else if (!random_seed
)
312 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
315 /* Obtain the random_seed. Unless NOINIT, initialize it if
316 it's not provided in the command line. */
319 get_random_seed (bool noinit
)
321 if (!flag_random_seed
&& !noinit
)
326 /* Modify the random_seed string to VAL. Return its previous
330 set_random_seed (const char *val
)
332 const char *old
= flag_random_seed
;
333 flag_random_seed
= val
;
337 /* Handler for fatal signals, such as SIGSEGV. These are transformed
338 into ICE messages, which is much more user friendly. In case the
339 error printer crashes, reset the signal to prevent infinite recursion. */
342 crash_signal (int signo
)
344 signal (signo
, SIG_DFL
);
346 /* If we crashed while processing an ASM statement, then be a little more
347 graceful. It's most likely the user's fault. */
348 if (this_is_asm_operands
)
350 output_operand_lossage ("unrecoverable error");
351 exit (FATAL_EXIT_CODE
);
354 internal_error ("%s", strsignal (signo
));
357 /* A subroutine of wrapup_global_declarations. We've come to the end of
358 the compilation unit. All deferred variables should be undeferred,
359 and all incomplete decls should be finalized. */
362 wrapup_global_declaration_1 (tree decl
)
364 /* We're not deferring this any longer. Assignment is conditional to
365 avoid needlessly dirtying PCH pages. */
366 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
367 && DECL_DEFER_OUTPUT (decl
) != 0)
368 DECL_DEFER_OUTPUT (decl
) = 0;
370 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
371 lang_hooks
.finish_incomplete_decl (decl
);
374 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
375 needs to be output. Return true if it is output. */
378 wrapup_global_declaration_2 (tree decl
)
380 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
383 /* Don't write out static consts, unless we still need them.
385 We also keep static consts if not optimizing (for debugging),
386 unless the user specified -fno-keep-static-consts.
387 ??? They might be better written into the debug information.
388 This is possible when using DWARF.
390 A language processor that wants static constants to be always
391 written out (even if it is not used) is responsible for
392 calling rest_of_decl_compilation itself. E.g. the C front-end
393 calls rest_of_decl_compilation from finish_decl.
394 One motivation for this is that is conventional in some
395 environments to write things like:
396 static const char rcsid[] = "... version string ...";
397 intending to force the string to be in the executable.
399 A language processor that would prefer to have unneeded
400 static constants "optimized away" would just defer writing
401 them out until here. E.g. C++ does this, because static
402 constants are often defined in header files.
404 ??? A tempting alternative (for both C and C++) would be
405 to force a constant to be written if and only if it is
406 defined in a main file, as opposed to an include file. */
408 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
410 struct varpool_node
*node
;
412 node
= varpool_get_node (decl
);
414 if (!node
&& flag_ltrans
)
416 else if (node
&& node
->finalized
)
418 else if (node
&& node
->alias
)
420 else if (!cgraph_global_info_ready
422 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
424 else if (node
&& node
->needed
)
426 else if (DECL_COMDAT (decl
))
428 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
429 && (optimize
|| !flag_keep_static_consts
430 || DECL_ARTIFICIAL (decl
)))
435 rest_of_decl_compilation (decl
, 1, 1);
443 /* Do any final processing required for the declarations in VEC, of
444 which there are LEN. We write out inline functions and variables
445 that have been deferred until this point, but which are required.
446 Returns nonzero if anything was put out. */
449 wrapup_global_declarations (tree
*vec
, int len
)
451 bool reconsider
, output_something
= false;
454 for (i
= 0; i
< len
; i
++)
455 wrapup_global_declaration_1 (vec
[i
]);
457 /* Now emit any global variables or functions that we have been
458 putting off. We need to loop in case one of the things emitted
459 here references another one which comes earlier in the list. */
463 for (i
= 0; i
< len
; i
++)
464 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
466 output_something
= true;
470 return output_something
;
473 /* A subroutine of check_global_declarations. Issue appropriate warnings
474 for the global declaration DECL. */
477 check_global_declaration_1 (tree decl
)
479 /* Warn about any function declared static but not defined. We don't
480 warn about variables, because many programs have static variables
481 that exist only to get some text into the object file. */
482 if (TREE_CODE (decl
) == FUNCTION_DECL
483 && DECL_INITIAL (decl
) == 0
484 && DECL_EXTERNAL (decl
)
485 && ! DECL_ARTIFICIAL (decl
)
486 && ! TREE_NO_WARNING (decl
)
487 && ! TREE_PUBLIC (decl
)
488 && (warn_unused_function
489 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
491 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
492 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
494 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
495 /* This symbol is effectively an "extern" declaration now. */
496 TREE_PUBLIC (decl
) = 1;
497 assemble_external (decl
);
500 /* Warn about static fns or vars defined but not used. */
501 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
502 /* We don't warn about "static const" variables because the
503 "rcs_id" idiom uses that construction. */
504 || (warn_unused_variable
505 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
506 && ! DECL_IN_SYSTEM_HEADER (decl
)
507 && ! TREE_USED (decl
)
508 /* The TREE_USED bit for file-scope decls is kept in the identifier,
509 to handle multiple external decls in different scopes. */
510 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
511 && ! DECL_EXTERNAL (decl
)
512 && ! TREE_PUBLIC (decl
)
513 /* A volatile variable might be used in some non-obvious way. */
514 && ! TREE_THIS_VOLATILE (decl
)
515 /* Global register variables must be declared to reserve them. */
516 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
517 /* Otherwise, ask the language. */
518 && lang_hooks
.decls
.warn_unused_global (decl
))
519 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
520 ? OPT_Wunused_function
521 : OPT_Wunused_variable
,
522 "%q+D defined but not used", decl
);
525 /* Issue appropriate warnings for the global declarations in VEC (of
526 which there are LEN). */
529 check_global_declarations (tree
*vec
, int len
)
533 for (i
= 0; i
< len
; i
++)
534 check_global_declaration_1 (vec
[i
]);
537 /* Emit debugging information for all global declarations in VEC. */
540 emit_debug_global_declarations (tree
*vec
, int len
)
544 /* Avoid confusing the debug information machinery when there are errors. */
548 timevar_push (TV_SYMOUT
);
549 for (i
= 0; i
< len
; i
++)
550 debug_hooks
->global_decl (vec
[i
]);
551 timevar_pop (TV_SYMOUT
);
554 /* Compile an entire translation unit. Write a file of assembly
555 output and various debugging dumps. */
560 timevar_start (TV_PHASE_PARSING
);
561 timevar_push (TV_PARSE_GLOBAL
);
563 /* Call the parser, which parses the entire file (calling
564 rest_of_compilation for each function). */
565 lang_hooks
.parse_file ();
567 timevar_pop (TV_PARSE_GLOBAL
);
568 timevar_stop (TV_PHASE_PARSING
);
570 /* Compilation is now finished except for writing
571 what's left of the symbol table output. */
573 if (flag_syntax_only
|| flag_wpa
)
576 timevar_start (TV_PHASE_GENERATE
);
578 ggc_protect_identifiers
= false;
580 /* This must also call cgraph_finalize_compilation_unit. */
581 lang_hooks
.decls
.final_write_globals ();
585 timevar_stop (TV_PHASE_GENERATE
);
589 /* Compilation unit is finalized. When producing non-fat LTO object, we are
590 basically finished. */
591 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
593 varpool_assemble_pending_decls ();
596 /* Likewise for mudflap static object registrations. */
598 mudflap_finish_file ();
600 output_shared_constant_pool ();
601 output_object_blocks ();
602 finish_tm_clone_pairs ();
604 /* Write out any pending weak symbol declarations. */
607 /* This must be at the end before unwind and debug info.
608 Some target ports emit PIC setup thunks here. */
609 targetm
.asm_out
.code_end ();
611 /* Do dbx symbols. */
612 timevar_push (TV_SYMOUT
);
614 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
615 if (dwarf2out_do_frame ())
616 dwarf2out_frame_finish ();
619 (*debug_hooks
->finish
) (main_input_filename
);
620 timevar_pop (TV_SYMOUT
);
622 /* Output some stuff at end of file if nec. */
624 dw2_output_indirect_constants ();
626 /* Flush any pending external directives. */
627 process_pending_assemble_externals ();
630 /* Emit LTO marker if LTO info has been previously emitted. This is
631 used by collect2 to determine whether an object file contains IL.
632 We used to emit an undefined reference here, but this produces
633 link errors if an object file with IL is stored into a shared
634 library without invoking lto1. */
635 if (flag_generate_lto
)
637 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
638 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
640 (unsigned HOST_WIDE_INT
) 1, 8);
641 #elif defined ASM_OUTPUT_ALIGNED_COMMON
642 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
643 (unsigned HOST_WIDE_INT
) 1, 8);
645 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
646 (unsigned HOST_WIDE_INT
) 1,
647 (unsigned HOST_WIDE_INT
) 1);
649 /* Let linker plugin know that this is a slim object and must be LTOed
650 even when user did not ask for it. */
651 if (!flag_fat_lto_objects
)
653 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
654 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
656 (unsigned HOST_WIDE_INT
) 1, 8);
657 #elif defined ASM_OUTPUT_ALIGNED_COMMON
658 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
659 (unsigned HOST_WIDE_INT
) 1, 8);
661 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
662 (unsigned HOST_WIDE_INT
) 1,
663 (unsigned HOST_WIDE_INT
) 1);
668 /* Attach a special .ident directive to the end of the file to identify
669 the version of GCC which compiled this code. The format of the .ident
670 string is patterned after the ones produced by native SVR4 compilers. */
674 const char *pkg_version
= "(GNU) ";
676 if (strcmp ("(GCC) ", pkgversion_string
))
677 pkg_version
= pkgversion_string
;
678 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
679 IDENT_ASM_OP
, pkg_version
, version_string
);
683 /* Invoke registered plugin callbacks. */
684 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
686 /* This must be at the end. Some target ports emit end of file directives
687 into the assembly file here, and hence we can not output anything to the
688 assembly file after this point. */
689 targetm
.asm_out
.file_end ();
691 timevar_stop (TV_PHASE_GENERATE
);
694 /* Print version information to FILE.
695 Each line begins with INDENT (for the case where FILE is the
696 assembler output file). */
699 print_version (FILE *file
, const char *indent
)
701 static const char fmt1
[] =
703 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
705 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
708 static const char fmt2
[] =
709 N_("GMP version %s, MPFR version %s, MPC version %s\n");
710 static const char fmt3
[] =
711 N_("%s%swarning: %s header version %s differs from library version %s.\n");
712 static const char fmt4
[] =
713 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
715 #define __VERSION__ "[?]"
718 file
== stderr
? _(fmt1
) : fmt1
,
719 indent
, *indent
!= 0 ? " " : "",
720 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
721 indent
, __VERSION__
);
723 /* We need to stringify the GMP macro values. Ugh, gmp_version has
724 two string formats, "i.j.k" and "i.j" when k is zero. As of
725 gmp-4.3.0, GMP always uses the 3 number format. */
726 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
727 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
728 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
729 #define GCC_GMP_VERSION \
730 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
731 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
732 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
733 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
735 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
736 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
737 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
740 file
== stderr
? _(fmt2
) : fmt2
,
741 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
742 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
744 file
== stderr
? _(fmt3
) : fmt3
,
745 indent
, *indent
!= 0 ? " " : "",
746 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
747 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
749 file
== stderr
? _(fmt3
) : fmt3
,
750 indent
, *indent
!= 0 ? " " : "",
751 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
752 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
754 file
== stderr
? _(fmt3
) : fmt3
,
755 indent
, *indent
!= 0 ? " " : "",
756 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
758 file
== stderr
? _(fmt4
) : fmt4
,
759 indent
, *indent
!= 0 ? " " : "",
760 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
762 print_plugins_versions (file
, indent
);
766 print_to_asm_out_file (print_switch_type type
, const char * text
)
768 bool prepend_sep
= true;
772 case SWITCH_TYPE_LINE_END
:
773 putc ('\n', asm_out_file
);
776 case SWITCH_TYPE_LINE_START
:
777 fputs (ASM_COMMENT_START
, asm_out_file
);
778 return strlen (ASM_COMMENT_START
);
780 case SWITCH_TYPE_DESCRIPTIVE
:
781 if (ASM_COMMENT_START
[0] == 0)
784 case SWITCH_TYPE_PASSED
:
785 case SWITCH_TYPE_ENABLED
:
787 fputc (' ', asm_out_file
);
788 fputs (text
, asm_out_file
);
789 /* No need to return the length here as
790 print_single_switch has already done it. */
799 print_to_stderr (print_switch_type type
, const char * text
)
803 case SWITCH_TYPE_LINE_END
:
807 case SWITCH_TYPE_LINE_START
:
810 case SWITCH_TYPE_PASSED
:
811 case SWITCH_TYPE_ENABLED
:
815 case SWITCH_TYPE_DESCRIPTIVE
:
816 fputs (text
, stderr
);
817 /* No need to return the length here as
818 print_single_switch has already done it. */
826 /* Print an option value and return the adjusted position in the line.
827 ??? print_fn doesn't handle errors, eg disk full; presumably other
828 code will catch a disk full though. */
831 print_single_switch (print_switch_fn_type print_fn
,
833 print_switch_type type
,
836 /* The ultrix fprintf returns 0 on success, so compute the result
837 we want here since we need it for the following test. The +1
838 is for the separator character that will probably be emitted. */
839 int len
= strlen (text
) + 1;
842 && pos
+ len
> MAX_LINE
)
844 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
849 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
851 print_fn (type
, text
);
855 /* Print active target switches using PRINT_FN.
856 POS is the current cursor position and MAX is the size of a "line".
857 Each line begins with INDENT and ends with TERM.
858 Each switch is separated from the next by SEP. */
861 print_switch_values (print_switch_fn_type print_fn
)
866 /* Fill in the -frandom-seed option, if the user didn't pass it, so
867 that it can be printed below. This helps reproducibility. */
868 if (!flag_random_seed
)
871 /* Print the options as passed. */
872 pos
= print_single_switch (print_fn
, pos
,
873 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
875 for (j
= 1; j
< save_decoded_options_count
; j
++)
877 switch (save_decoded_options
[j
].opt_index
)
890 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
891 save_decoded_options
[j
].orig_option_with_args_text
);
895 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
897 /* Print the -f and -m options that have been enabled.
898 We don't handle language specific options but printing argv
900 pos
= print_single_switch (print_fn
, 0,
901 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
903 for (j
= 0; j
< cl_options_count
; j
++)
904 if (cl_options
[j
].cl_report
905 && option_enabled (j
, &global_options
) > 0)
906 pos
= print_single_switch (print_fn
, pos
,
907 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
909 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
912 /* Open assembly code output file. Do this even if -fsyntax-only is
913 on, because then the driver will have provided the name of a
914 temporary file or bit bucket for us. NAME is the file specified on
915 the command line, possibly NULL. */
917 init_asm_output (const char *name
)
919 if (name
== NULL
&& asm_file_name
== 0)
920 asm_out_file
= stdout
;
923 if (asm_file_name
== 0)
925 int len
= strlen (dump_base_name
);
926 char *dumpname
= XNEWVEC (char, len
+ 6);
928 memcpy (dumpname
, dump_base_name
, len
+ 1);
929 strip_off_ending (dumpname
, len
);
930 strcat (dumpname
, ".s");
931 asm_file_name
= dumpname
;
933 if (!strcmp (asm_file_name
, "-"))
934 asm_out_file
= stdout
;
936 asm_out_file
= fopen (asm_file_name
, "w+b");
937 if (asm_out_file
== 0)
938 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
941 if (!flag_syntax_only
)
943 targetm
.asm_out
.file_start ();
945 if (flag_record_gcc_switches
)
947 if (targetm
.asm_out
.record_gcc_switches
)
949 /* Let the target know that we are about to start recording. */
950 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
952 /* Now record the switches. */
953 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
954 /* Let the target know that the recording is over. */
955 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
959 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
962 if (flag_verbose_asm
)
964 /* Print the list of switches in effect
965 into the assembler file as comments. */
966 print_version (asm_out_file
, ASM_COMMENT_START
);
967 print_switch_values (print_to_asm_out_file
);
968 putc ('\n', asm_out_file
);
973 /* Default tree printer. Handles declarations only. */
975 default_tree_printer (pretty_printer
*pp
, text_info
*text
, const char *spec
,
976 int precision
, bool wide
, bool set_locus
, bool hash
)
980 /* FUTURE: %+x should set the locus. */
981 if (precision
!= 0 || wide
|| hash
)
987 t
= va_arg (*text
->args_ptr
, tree
);
988 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
990 pp_identifier (pp
, IDENTIFIER_POINTER (t
));
996 t
= va_arg (*text
->args_ptr
, tree
);
997 if (DECL_DEBUG_EXPR_IS_FROM (t
) && DECL_DEBUG_EXPR (t
))
998 t
= DECL_DEBUG_EXPR (t
);
1003 t
= va_arg (*text
->args_ptr
, tree
);
1007 percent_K_format (text
);
1014 if (set_locus
&& text
->locus
)
1015 *text
->locus
= DECL_SOURCE_LOCATION (t
);
1019 const char *n
= DECL_NAME (t
)
1020 ? identifier_to_locale (lang_hooks
.decl_printable_name (t
, 2))
1025 dump_generic_node (pp
, t
, 0, TDF_DIAGNOSTIC
, 0);
1030 /* A helper function; used as the reallocator function for cpp's line
1033 realloc_for_line_map (void *ptr
, size_t len
)
1035 return GGC_RESIZEVAR (void, ptr
, len
);
1038 /* A helper function: used as the allocator function for
1039 identifier_to_locale. */
1041 alloc_for_identifier_to_locale (size_t len
)
1043 return ggc_alloc_atomic (len
);
1046 /* Output stack usage information. */
1048 output_stack_usage (void)
1050 static bool warning_issued
= false;
1051 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
1052 const char *stack_usage_kind_str
[] = {
1057 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
1058 enum stack_usage_kind_type stack_usage_kind
;
1060 if (stack_usage
< 0)
1062 if (!warning_issued
)
1064 warning (0, "stack usage computation not supported for this target");
1065 warning_issued
= true;
1070 stack_usage_kind
= STATIC
;
1072 /* Add the maximum amount of space pushed onto the stack. */
1073 if (current_function_pushed_stack_size
> 0)
1075 stack_usage
+= current_function_pushed_stack_size
;
1076 stack_usage_kind
= DYNAMIC_BOUNDED
;
1079 /* Now on to the tricky part: dynamic stack allocation. */
1080 if (current_function_allocates_dynamic_stack_space
)
1082 if (current_function_has_unbounded_dynamic_stack_size
)
1083 stack_usage_kind
= DYNAMIC
;
1085 stack_usage_kind
= DYNAMIC_BOUNDED
;
1087 /* Add the size even in the unbounded case, this can't hurt. */
1088 stack_usage
+= current_function_dynamic_stack_size
;
1091 if (flag_stack_usage
)
1093 expanded_location loc
1094 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1095 const char *raw_id
, *id
;
1097 /* Strip the scope prefix if any. */
1098 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1099 id
= strrchr (raw_id
, '.');
1105 fprintf (stack_usage_file
,
1106 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1107 lbasename (loc
.file
),
1112 stack_usage_kind_str
[stack_usage_kind
]);
1115 if (warn_stack_usage
>= 0)
1117 if (stack_usage_kind
== DYNAMIC
)
1118 warning (OPT_Wstack_usage_
, "stack usage might be unbounded");
1119 else if (stack_usage
> warn_stack_usage
)
1121 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1122 warning (OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1125 warning (OPT_Wstack_usage_
, "stack usage is %wd bytes",
1131 /* Open an auxiliary output file. */
1133 open_auxiliary_file (const char *ext
)
1138 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1139 file
= fopen (filename
, "w");
1141 fatal_error ("can%'t open %s for writing: %m", filename
);
1146 /* Initialization of the front end environment, before command line
1147 options are parsed. Signal handlers, internationalization etc.
1148 ARGV0 is main's argv[0]. */
1150 general_init (const char *argv0
)
1154 p
= argv0
+ strlen (argv0
);
1155 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1159 xmalloc_set_program_name (progname
);
1163 /* Unlock the stdio streams. */
1164 unlock_std_streams ();
1166 gcc_init_libintl ();
1168 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1169 identifier_to_locale_free
= ggc_free
;
1171 /* Initialize the diagnostics reporting machinery, so option parsing
1172 can give warnings and errors. */
1173 diagnostic_initialize (global_dc
, N_OPTS
);
1174 diagnostic_starter (global_dc
) = default_tree_diagnostic_starter
;
1175 /* By default print macro expansion contexts in the diagnostic
1176 finalizer -- for tokens resulting from macro macro expansion. */
1177 diagnostic_finalizer (global_dc
) = virt_loc_aware_diagnostic_finalizer
;
1178 /* Set a default printer. Language specific initializations will
1179 override it later. */
1180 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
1181 global_dc
->show_option_requested
1182 = global_options_init
.x_flag_diagnostics_show_option
;
1183 global_dc
->show_column
1184 = global_options_init
.x_flag_show_column
;
1185 global_dc
->internal_error
= plugins_internal_error_function
;
1186 global_dc
->option_enabled
= option_enabled
;
1187 global_dc
->option_state
= &global_options
;
1188 global_dc
->option_name
= option_name
;
1190 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1192 signal (SIGSEGV
, crash_signal
);
1195 signal (SIGILL
, crash_signal
);
1198 signal (SIGBUS
, crash_signal
);
1201 signal (SIGABRT
, crash_signal
);
1203 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1204 signal (SIGIOT
, crash_signal
);
1207 signal (SIGFPE
, crash_signal
);
1210 /* Other host-specific signal setup. */
1211 (*host_hooks
.extra_signals
)();
1213 /* Initialize the garbage-collector, string pools and tree type hash
1217 line_table
= ggc_alloc_line_maps ();
1218 linemap_init (line_table
);
1219 line_table
->reallocator
= realloc_for_line_map
;
1220 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1223 /* Initialize register usage now so switches may override. */
1226 /* Register the language-independent parameters. */
1227 global_init_params ();
1229 /* This must be done after global_init_params but before argument
1231 init_ggc_heuristics();
1232 init_optimization_passes ();
1233 statistics_early_init ();
1237 /* Return true if the current target supports -fsection-anchors. */
1240 target_supports_section_anchors_p (void)
1242 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1245 if (targetm
.asm_out
.output_anchor
== NULL
)
1251 /* Default the align_* variables to 1 if they're still unset, and
1252 set up the align_*_log variables. */
1254 init_alignments (void)
1256 if (align_loops
<= 0)
1258 if (align_loops_max_skip
> align_loops
)
1259 align_loops_max_skip
= align_loops
- 1;
1260 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1261 if (align_jumps
<= 0)
1263 if (align_jumps_max_skip
> align_jumps
)
1264 align_jumps_max_skip
= align_jumps
- 1;
1265 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1266 if (align_labels
<= 0)
1268 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1269 if (align_labels_max_skip
> align_labels
)
1270 align_labels_max_skip
= align_labels
- 1;
1271 if (align_functions
<= 0)
1272 align_functions
= 1;
1273 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1276 /* Process the options that have been parsed. */
1278 process_options (void)
1280 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1281 This can happen with incorrect pre-processed input. */
1282 debug_hooks
= &do_nothing_debug_hooks
;
1284 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1286 /* Allow the front end to perform consistency checks and do further
1287 initialization based on the command line options. This hook also
1288 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1289 so we can correctly initialize debug output. */
1290 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1292 /* Some machines may reject certain combinations of options. */
1293 targetm
.target_option
.override ();
1295 /* Avoid any informative notes in the second run of -fcompare-debug. */
1296 if (flag_compare_debug
)
1297 diagnostic_inhibit_notes (global_dc
);
1299 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1301 warning (OPT_fsection_anchors
,
1302 "this target does not support %qs", "-fsection-anchors");
1303 flag_section_anchors
= 0;
1306 if (flag_short_enums
== 2)
1307 flag_short_enums
= targetm
.default_short_enums ();
1309 /* Set aux_base_name if not already set. */
1312 else if (main_input_filename
)
1314 char *name
= xstrdup (lbasename (main_input_filename
));
1316 strip_off_ending (name
, strlen (name
));
1317 aux_base_name
= name
;
1320 aux_base_name
= "gccaux";
1324 || flag_graphite_identity
1326 || flag_loop_flatten
1327 || flag_loop_interchange
1328 || flag_loop_strip_mine
1329 || flag_loop_parallelize_all
)
1330 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1331 "-fgraphite-identity, -floop-block, -floop-flatten, "
1332 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1333 "and -ftree-loop-linear)");
1336 /* Unrolling all loops implies that standard loop unrolling must also
1338 if (flag_unroll_all_loops
)
1339 flag_unroll_loops
= 1;
1341 /* web and rename-registers help when run after loop unrolling. */
1342 if (flag_web
== AUTODETECT_VALUE
)
1343 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1345 if (flag_rename_registers
== AUTODETECT_VALUE
)
1346 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1348 if (flag_non_call_exceptions
)
1349 flag_asynchronous_unwind_tables
= 1;
1350 if (flag_asynchronous_unwind_tables
)
1351 flag_unwind_tables
= 1;
1353 if (flag_value_profile_transformations
)
1354 flag_profile_values
= 1;
1356 /* Warn about options that are not supported on this machine. */
1357 #ifndef INSN_SCHEDULING
1358 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1359 warning (0, "instruction scheduling not supported on this target machine");
1362 if (flag_delayed_branch
)
1363 warning (0, "this target machine does not have delayed branches");
1366 user_label_prefix
= USER_LABEL_PREFIX
;
1367 if (flag_leading_underscore
!= -1)
1369 /* If the default prefix is more complicated than "" or "_",
1370 issue a warning and ignore this option. */
1371 if (user_label_prefix
[0] == 0 ||
1372 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1374 user_label_prefix
= flag_leading_underscore
? "_" : "";
1377 warning (0, "-f%sleading-underscore not supported on this target machine",
1378 flag_leading_underscore
? "" : "no-");
1381 /* If we are in verbose mode, write out the version and maybe all the
1382 option flags in use. */
1385 print_version (stderr
, "");
1387 print_switch_values (print_to_stderr
);
1390 if (flag_syntax_only
)
1392 write_symbols
= NO_DEBUG
;
1398 if (debug_info_level
== DINFO_LEVEL_NONE
)
1400 debug_info_level
= DINFO_LEVEL_NORMAL
;
1402 if (write_symbols
== NO_DEBUG
)
1403 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1406 debug_info_level
= DINFO_LEVEL_NONE
;
1409 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1411 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1414 error ("could not open final insn dump file %qs: %m",
1415 flag_dump_final_insns
);
1416 flag_dump_final_insns
= NULL
;
1418 else if (fclose (final_output
))
1420 error ("could not close zeroed insn dump file %qs: %m",
1421 flag_dump_final_insns
);
1422 flag_dump_final_insns
= NULL
;
1426 /* Unless over-ridden for the target, assume that all DWARF levels
1427 may be emitted, if DWARF2_DEBUG is selected. */
1428 if (dwarf_strict
< 0)
1431 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1433 if (debug_info_level
== DINFO_LEVEL_NONE
)
1434 write_symbols
= NO_DEBUG
;
1436 if (write_symbols
== NO_DEBUG
)
1438 #if defined(DBX_DEBUGGING_INFO)
1439 else if (write_symbols
== DBX_DEBUG
)
1440 debug_hooks
= &dbx_debug_hooks
;
1442 #if defined(XCOFF_DEBUGGING_INFO)
1443 else if (write_symbols
== XCOFF_DEBUG
)
1444 debug_hooks
= &xcoff_debug_hooks
;
1446 #ifdef SDB_DEBUGGING_INFO
1447 else if (write_symbols
== SDB_DEBUG
)
1448 debug_hooks
= &sdb_debug_hooks
;
1450 #ifdef DWARF2_DEBUGGING_INFO
1451 else if (write_symbols
== DWARF2_DEBUG
)
1452 debug_hooks
= &dwarf2_debug_hooks
;
1454 #ifdef VMS_DEBUGGING_INFO
1455 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1456 debug_hooks
= &vmsdbg_debug_hooks
;
1459 error ("target system does not support the \"%s\" debug format",
1460 debug_type_names
[write_symbols
]);
1462 /* We know which debug output will be used so we can set flag_var_tracking
1463 and flag_var_tracking_uninit if the user has not specified them. */
1464 if (debug_info_level
< DINFO_LEVEL_NORMAL
1465 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1467 if (flag_var_tracking
== 1
1468 || flag_var_tracking_uninit
== 1)
1470 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1471 warning (0, "variable tracking requested, but useless unless "
1472 "producing debug info");
1474 warning (0, "variable tracking requested, but not supported "
1475 "by this debug format");
1477 flag_var_tracking
= 0;
1478 flag_var_tracking_uninit
= 0;
1481 /* The debug hooks are used to implement -fdump-go-spec because it
1482 gives a simple and stable API for all the information we need to
1484 if (flag_dump_go_spec
!= NULL
)
1485 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1487 /* If the user specifically requested variable tracking with tagging
1488 uninitialized variables, we need to turn on variable tracking.
1489 (We already determined above that variable tracking is feasible.) */
1490 if (flag_var_tracking_uninit
)
1491 flag_var_tracking
= 1;
1493 if (flag_var_tracking
== AUTODETECT_VALUE
)
1494 flag_var_tracking
= optimize
>= 1;
1496 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1497 flag_var_tracking_assignments
= flag_var_tracking
1498 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1500 if (flag_var_tracking_assignments_toggle
)
1501 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1503 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1504 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1506 if (flag_var_tracking_assignments
1507 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1508 warning (0, "var-tracking-assignments changes selective scheduling");
1510 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1511 #ifdef HAVE_conditional_move
1512 flag_tree_cselim
= 1;
1514 flag_tree_cselim
= 0;
1517 /* If auxiliary info generation is desired, open the output file.
1518 This goes in the same directory as the source file--unlike
1519 all the other output files. */
1520 if (flag_gen_aux_info
)
1522 aux_info_file
= fopen (aux_info_file_name
, "w");
1523 if (aux_info_file
== 0)
1524 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1527 if (!targetm_common
.have_named_sections
)
1529 if (flag_function_sections
)
1531 warning (0, "-ffunction-sections not supported for this target");
1532 flag_function_sections
= 0;
1534 if (flag_data_sections
)
1536 warning (0, "-fdata-sections not supported for this target");
1537 flag_data_sections
= 0;
1541 if (flag_function_sections
&& profile_flag
)
1543 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1544 flag_function_sections
= 0;
1547 #ifndef HAVE_prefetch
1548 if (flag_prefetch_loop_arrays
> 0)
1550 warning (0, "-fprefetch-loop-arrays not supported for this target");
1551 flag_prefetch_loop_arrays
= 0;
1554 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1556 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1557 flag_prefetch_loop_arrays
= 0;
1561 /* This combination of options isn't handled for i386 targets and doesn't
1562 make much sense anyway, so don't allow it. */
1563 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1565 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1566 flag_prefetch_loop_arrays
= 0;
1569 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1570 if (flag_signaling_nans
)
1571 flag_trapping_math
= 1;
1573 /* We cannot reassociate if we want traps or signed zeros. */
1574 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1576 warning (0, "-fassociative-math disabled; other options take precedence");
1577 flag_associative_math
= 0;
1580 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1581 if (flag_cx_limited_range
)
1582 flag_complex_method
= 0;
1584 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1585 if (flag_cx_fortran_rules
)
1586 flag_complex_method
= 1;
1588 /* Targets must be able to place spill slots at lower addresses. If the
1589 target already uses a soft frame pointer, the transition is trivial. */
1590 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1592 warning (0, "-fstack-protector not supported for this target");
1593 flag_stack_protect
= 0;
1595 if (!flag_stack_protect
)
1596 warn_stack_protect
= 0;
1598 /* ??? Unwind info is not correct around the CFG unless either a frame
1599 pointer is present or A_O_A is set. Fixing this requires rewriting
1600 unwind info generation to be aware of the CFG and propagating states
1602 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1603 && flag_omit_frame_pointer
)
1605 warning (0, "unwind tables currently require a frame pointer "
1607 flag_omit_frame_pointer
= 0;
1610 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1611 have not been set. */
1612 if (!global_options_set
.x_warnings_are_errors
1613 && warn_coverage_mismatch
1614 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1616 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1617 DK_ERROR
, UNKNOWN_LOCATION
);
1619 /* Save the current optimization options. */
1620 optimization_default_node
= build_optimization_node ();
1621 optimization_current_node
= optimization_default_node
;
1624 /* This function can be called multiple times to reinitialize the compiler
1625 back end when register classes or instruction sets have changed,
1626 before each function. */
1628 backend_init_target (void)
1630 /* Initialize alignment variables. */
1633 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1634 to initialize reg_raw_mode[]. */
1637 /* This invokes target hooks to set fixed_reg[] etc, which is
1641 /* This depends on stack_pointer_rtx. */
1642 init_fake_stack_mems ();
1644 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1646 init_alias_target ();
1648 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1651 /* The following initialization functions need to generate rtl, so
1652 provide a dummy function context for them. */
1653 init_dummy_function_start ();
1655 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1656 on a mode change. */
1659 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1660 after a mode change as well. */
1661 caller_save_initialized_p
= false;
1663 expand_dummy_function_end ();
1666 /* Initialize the compiler back end. This function is called only once,
1667 when starting the compiler. */
1674 init_inline_once ();
1675 init_varasm_once ();
1676 save_register_info ();
1678 /* Initialize the target-specific back end pieces. */
1680 backend_init_target ();
1683 /* Initialize excess precision settings. */
1685 init_excess_precision (void)
1687 /* Adjust excess precision handling based on the target options. If
1688 the front end cannot handle it, flag_excess_precision_cmdline
1689 will already have been set accordingly in the post_options
1691 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1692 flag_excess_precision
= flag_excess_precision_cmdline
;
1693 if (flag_unsafe_math_optimizations
)
1694 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1695 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1697 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1698 switch (flt_eval_method
)
1702 /* Either the target acts unpredictably (-1) or has all the
1703 operations required not to have excess precision (0). */
1704 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1708 /* In these cases, predictable excess precision makes
1712 /* Any other implementation-defined FLT_EVAL_METHOD values
1713 require the compiler to handle the associated excess
1714 precision rules in excess_precision_type. */
1720 /* Initialize things that are both lang-dependent and target-dependent.
1721 This function can be called more than once if target parameters change. */
1723 lang_dependent_init_target (void)
1725 /* This determines excess precision settings. */
1726 init_excess_precision ();
1728 /* This creates various _DECL nodes, so needs to be called after the
1729 front end is initialized. It also depends on the HAVE_xxx macros
1730 generated from the target machine description. */
1733 /* The following initialization functions need to generate rtl, so
1734 provide a dummy function context for them. */
1735 init_dummy_function_start ();
1737 /* Do the target-specific parts of expr initialization. */
1738 init_expr_target ();
1740 /* Although the actions of these functions are language-independent,
1741 they use optabs, so we cannot call them from backend_init. */
1745 expand_dummy_function_end ();
1748 /* Language-dependent initialization. Returns nonzero on success. */
1750 lang_dependent_init (const char *name
)
1752 location_t save_loc
= input_location
;
1753 if (dump_base_name
== 0)
1754 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1756 /* Other front-end initialization. */
1757 input_location
= BUILTINS_LOCATION
;
1758 if (lang_hooks
.init () == 0)
1760 input_location
= save_loc
;
1764 init_asm_output (name
);
1766 /* If stack usage information is desired, open the output file. */
1767 if (flag_stack_usage
)
1768 stack_usage_file
= open_auxiliary_file ("su");
1771 /* This creates various _DECL nodes, so needs to be called after the
1772 front end is initialized. */
1775 /* Do the target-specific parts of the initialization. */
1776 lang_dependent_init_target ();
1780 /* If dbx symbol table desired, initialize writing it and output the
1781 predefined types. */
1782 timevar_push (TV_SYMOUT
);
1784 /* Now we have the correct original filename, we can initialize
1786 (*debug_hooks
->init
) (name
);
1788 timevar_pop (TV_SYMOUT
);
1795 /* Reinitialize everything when target parameters, such as register usage,
1798 target_reinit (void)
1800 struct rtl_data saved_x_rtl
;
1801 rtx
*saved_regno_reg_rtx
;
1803 /* Save *crtl and regno_reg_rtx around the reinitialization
1804 to allow target_reinit being called even after prepare_function_start. */
1805 saved_regno_reg_rtx
= regno_reg_rtx
;
1806 if (saved_regno_reg_rtx
)
1808 saved_x_rtl
= *crtl
;
1809 memset (crtl
, '\0', sizeof (*crtl
));
1810 regno_reg_rtx
= NULL
;
1813 /* Reinitialize RTL backend. */
1814 backend_init_target ();
1816 /* Reinitialize lang-dependent parts. */
1817 lang_dependent_init_target ();
1819 /* And restore it at the end, as free_after_compilation from
1820 expand_dummy_function_end clears it. */
1821 if (saved_regno_reg_rtx
)
1823 *crtl
= saved_x_rtl
;
1824 regno_reg_rtx
= saved_regno_reg_rtx
;
1825 saved_regno_reg_rtx
= NULL
;
1830 dump_memory_report (bool final
)
1832 dump_line_table_statistics ();
1833 ggc_print_statistics ();
1834 stringpool_statistics ();
1835 dump_tree_statistics ();
1836 dump_gimple_statistics ();
1837 dump_rtx_statistics ();
1838 dump_alloc_pool_statistics ();
1839 dump_bitmap_statistics ();
1840 dump_vec_loc_statistics ();
1841 dump_ggc_loc_statistics (final
);
1842 dump_alias_stats (stderr
);
1843 dump_pta_stats (stderr
);
1846 /* Clean up: close opened files, etc. */
1849 finalize (bool no_backend
)
1851 /* Close the dump files. */
1852 if (flag_gen_aux_info
)
1854 fclose (aux_info_file
);
1856 unlink (aux_info_file_name
);
1859 /* Close non-debugging input and output files. Take special care to note
1860 whether fclose returns an error, since the pages might still be on the
1861 buffer chain while the file is open. */
1865 if (ferror (asm_out_file
) != 0)
1866 fatal_error ("error writing to %s: %m", asm_file_name
);
1867 if (fclose (asm_out_file
) != 0)
1868 fatal_error ("error closing %s: %m", asm_file_name
);
1871 if (stack_usage_file
)
1872 fclose (stack_usage_file
);
1878 finish_optimization_passes ();
1884 dump_memory_report (true);
1886 /* Language-specific end of compilation actions. */
1887 lang_hooks
.finish ();
1890 /* Initialize the compiler, and compile the input file. */
1894 /* Initialize timing first. The C front ends read the main file in
1895 the post_options hook, and C++ does file timings. */
1896 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1898 timevar_start (TV_TOTAL
);
1902 /* Don't do any more if an error has already occurred. */
1905 timevar_start (TV_PHASE_SETUP
);
1907 /* This must be run always, because it is needed to compute the FP
1908 predefined macros, such as __LDBL_MAX__, for targets using non
1909 default FP formats. */
1910 init_adjust_machine_modes ();
1912 /* Set up the back-end if requested. */
1916 /* Language-dependent initialization. Returns true on success. */
1917 if (lang_dependent_init (main_input_filename
))
1919 /* Initialize yet another pass. */
1921 ggc_protect_identifiers
= true;
1924 init_final (main_input_filename
);
1925 coverage_init (aux_base_name
);
1927 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1929 timevar_stop (TV_PHASE_SETUP
);
1935 timevar_stop (TV_PHASE_SETUP
);
1938 timevar_start (TV_PHASE_FINALIZE
);
1940 finalize (no_backend
);
1942 timevar_stop (TV_PHASE_FINALIZE
);
1945 /* Stop timing and print the times. */
1946 timevar_stop (TV_TOTAL
);
1947 timevar_print (stderr
);
1950 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1951 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1952 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1954 It is not safe to call this function more than once. */
1957 toplev_main (int argc
, char **argv
)
1959 /* Parsing and gimplification sometimes need quite large stack.
1960 Increase stack size limits if possible. */
1961 stack_limit_increase (64 * 1024 * 1024);
1963 expandargv (&argc
, &argv
);
1965 /* Initialization of GCC's environment, and diagnostics. */
1966 general_init (argv
[0]);
1968 /* One-off initialization of options that does not need to be
1969 repeated when options are added for particular functions. */
1970 init_options_once ();
1972 /* Initialize global options structures; this must be repeated for
1973 each structure used for parsing options. */
1974 init_options_struct (&global_options
, &global_options_set
);
1975 lang_hooks
.init_options_struct (&global_options
);
1977 /* Convert the options to an array. */
1978 decode_cmdline_options_to_array_default_mask (argc
,
1979 CONST_CAST2 (const char **,
1981 &save_decoded_options
,
1982 &save_decoded_options_count
);
1984 /* Perform language-specific options initialization. */
1985 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1987 /* Parse the options and do minimal processing; basically just
1988 enough to default flags appropriately. */
1989 decode_options (&global_options
, &global_options_set
,
1990 save_decoded_options
, save_decoded_options_count
,
1991 UNKNOWN_LOCATION
, global_dc
);
1993 handle_common_deferred_options ();
1997 initialize_plugins ();
2000 print_version (stderr
, "");
2003 print_plugins_help (stderr
, "");
2005 /* Exit early if we can (e.g. -help). */
2006 if (!exit_after_options
)
2009 if (warningcount
|| errorcount
)
2010 print_ignored_options ();
2011 diagnostic_finish (global_dc
);
2013 /* Invoke registered plugin callbacks if any. */
2014 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2016 finalize_plugins ();
2018 return (FATAL_EXIT_CODE
);
2020 return (SUCCESS_EXIT_CODE
);