2006-08-06 Paolo Carlini <pcarlini@suse.de>
[official-gcc.git] / gcc / toplev.c
blob55019ed5413e98b3c3a30e36073ec48ea03a5553
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
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 2, or (at your option) any later
11 version.
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
16 for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
21 02110-1301, USA. */
23 /* This is the top level of cc1/c++.
24 It parses command args, opens files, invokes the various passes
25 in the proper order, and counts the time used by each.
26 Error messages and low-level interface to malloc also handled here. */
28 #include "config.h"
29 #undef FLOAT /* This is for hpux. They should change hpux. */
30 #undef FFS /* Some systems define this in param.h. */
31 #include "system.h"
32 #include "coretypes.h"
33 #include "tm.h"
34 #include <signal.h>
36 #ifdef HAVE_SYS_RESOURCE_H
37 # include <sys/resource.h>
38 #endif
40 #ifdef HAVE_SYS_TIMES_H
41 # include <sys/times.h>
42 #endif
44 #include "line-map.h"
45 #include "input.h"
46 #include "tree.h"
47 #include "version.h"
48 #include "rtl.h"
49 #include "tm_p.h"
50 #include "flags.h"
51 #include "insn-attr.h"
52 #include "insn-config.h"
53 #include "insn-flags.h"
54 #include "hard-reg-set.h"
55 #include "recog.h"
56 #include "output.h"
57 #include "except.h"
58 #include "function.h"
59 #include "toplev.h"
60 #include "expr.h"
61 #include "basic-block.h"
62 #include "intl.h"
63 #include "ggc.h"
64 #include "graph.h"
65 #include "regs.h"
66 #include "timevar.h"
67 #include "diagnostic.h"
68 #include "params.h"
69 #include "reload.h"
70 #include "dwarf2asm.h"
71 #include "integrate.h"
72 #include "real.h"
73 #include "debug.h"
74 #include "target.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
77 #include "cfgloop.h"
78 #include "hosthooks.h"
79 #include "cgraph.h"
80 #include "opts.h"
81 #include "coverage.h"
82 #include "value-prof.h"
83 #include "alloc-pool.h"
84 #include "tree-mudflap.h"
86 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
87 #include "dwarf2out.h"
88 #endif
90 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
91 #include "dbxout.h"
92 #endif
94 #ifdef SDB_DEBUGGING_INFO
95 #include "sdbout.h"
96 #endif
98 #ifdef XCOFF_DEBUGGING_INFO
99 #include "xcoffout.h" /* Needed for external data
100 declarations for e.g. AIX 4.x. */
101 #endif
103 static void general_init (const char *);
104 static void do_compile (void);
105 static void process_options (void);
106 static void backend_init (void);
107 static int lang_dependent_init (const char *);
108 static void init_asm_output (const char *);
109 static void finalize (void);
111 static void crash_signal (int) ATTRIBUTE_NORETURN;
112 static void setup_core_dumping (void);
113 static void compile_file (void);
115 static int print_single_switch (FILE *, int, int, const char *,
116 const char *, const char *,
117 const char *, const char *);
118 static void print_switch_values (FILE *, int, int, const char *,
119 const char *, const char *);
121 /* Nonzero to dump debug info whilst parsing (-dy option). */
122 static int set_yydebug;
124 /* True if we don't need a backend (e.g. preprocessing only). */
125 static bool no_backend;
127 /* Length of line when printing switch values. */
128 #define MAX_LINE 75
130 /* Name of program invoked, sans directories. */
132 const char *progname;
134 /* Copy of argument vector to toplev_main. */
135 static const char **save_argv;
137 /* Name of top-level original source file (what was input to cpp).
138 This comes from the #-command at the beginning of the actual input.
139 If there isn't any there, then this is the cc1 input file name. */
141 const char *main_input_filename;
143 #ifndef USE_MAPPED_LOCATION
144 location_t unknown_location = { NULL, 0 };
145 #endif
147 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
148 to optimize and default_debug_hooks in process_options (). */
149 #define AUTODETECT_VALUE 2
151 /* Current position in real source file. */
153 location_t input_location;
155 struct line_maps line_table;
157 /* Nonzero if it is unsafe to create any new pseudo registers. */
158 int no_new_pseudos;
160 /* Stack of currently pending input files. */
162 struct file_stack *input_file_stack;
164 /* Incremented on each change to input_file_stack. */
165 int input_file_stack_tick;
167 /* Name to use as base of names for dump output files. */
169 const char *dump_base_name;
171 /* Name to use as a base for auxiliary output files. */
173 const char *aux_base_name;
175 /* Bit flags that specify the machine subtype we are compiling for.
176 Bits are tested using macros TARGET_... defined in the tm.h file
177 and set by `-m...' switches. Must be defined in rtlanal.c. */
179 extern int target_flags;
181 /* A mask of target_flags that includes bit X if X was set or cleared
182 on the command line. */
184 int target_flags_explicit;
186 /* Debug hooks - dependent upon command line options. */
188 const struct gcc_debug_hooks *debug_hooks;
190 /* Debug hooks - target default. */
192 static const struct gcc_debug_hooks *default_debug_hooks;
194 /* Other flags saying which kinds of debugging dump have been requested. */
196 int rtl_dump_and_exit;
197 int flag_print_asm_name;
198 enum graph_dump_types graph_dump_format;
200 /* Name for output file of assembly code, specified with -o. */
202 const char *asm_file_name;
204 /* Nonzero means do optimizations. -O.
205 Particular numeric values stand for particular amounts of optimization;
206 thus, -O2 stores 2 here. However, the optimizations beyond the basic
207 ones are not controlled directly by this variable. Instead, they are
208 controlled by individual `flag_...' variables that are defaulted
209 based on this variable. */
211 int optimize = 0;
213 /* Nonzero means optimize for size. -Os.
214 The only valid values are zero and nonzero. When optimize_size is
215 nonzero, optimize defaults to 2, but certain individual code
216 bloating optimizations are disabled. */
218 int optimize_size = 0;
220 /* The FUNCTION_DECL for the function currently being compiled,
221 or 0 if between functions. */
222 tree current_function_decl;
224 /* Set to the FUNC_BEGIN label of the current function, or NULL
225 if none. */
226 const char * current_function_func_begin_label;
228 /* Temporarily suppress certain warnings.
229 This is set while reading code from a system header file. */
231 int in_system_header = 0;
233 /* Nonzero means to collect statistics which might be expensive
234 and to print them when we are done. */
235 int flag_detailed_statistics = 0;
237 /* A random sequence of characters, unless overridden by user. */
238 const char *flag_random_seed;
240 /* A local time stamp derived from the time of compilation. It will be
241 zero if the system cannot provide a time. It will be -1u, if the
242 user has specified a particular random seed. */
243 unsigned local_tick;
245 /* -f flags. */
247 /* Nonzero means `char' should be signed. */
249 int flag_signed_char;
251 /* Nonzero means give an enum type only as many bytes as it needs. A value
252 of 2 means it has not yet been initialized. */
254 int flag_short_enums;
256 /* Nonzero if structures and unions should be returned in memory.
258 This should only be defined if compatibility with another compiler or
259 with an ABI is needed, because it results in slower code. */
261 #ifndef DEFAULT_PCC_STRUCT_RETURN
262 #define DEFAULT_PCC_STRUCT_RETURN 1
263 #endif
265 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
267 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
269 /* 0 means straightforward implementation of complex divide acceptable.
270 1 means wide ranges of inputs must work for complex divide.
271 2 means C99-like requirements for complex multiply and divide. */
273 int flag_complex_method = 1;
275 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
276 not just because the tree inliner turned us off. */
278 int flag_really_no_inline = 2;
280 /* Nonzero means we should be saving declaration info into a .X file. */
282 int flag_gen_aux_info = 0;
284 /* Specified name of aux-info file. */
286 const char *aux_info_file_name;
288 /* Nonzero if we are compiling code for a shared library, zero for
289 executable. */
291 int flag_shlib;
293 /* Generate code for GNU or NeXT Objective-C runtime environment. */
295 #ifdef NEXT_OBJC_RUNTIME
296 int flag_next_runtime = 1;
297 #else
298 int flag_next_runtime = 0;
299 #endif
301 /* Set to the default thread-local storage (tls) model to use. */
303 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
305 /* Nonzero means change certain warnings into errors.
306 Usually these are warnings about failure to conform to some standard. */
308 int flag_pedantic_errors = 0;
310 /* -dA causes debug commentary information to be produced in
311 the generated assembly code (to make it more readable). This option
312 is generally only of use to those who actually need to read the
313 generated assembly code (perhaps while debugging the compiler itself).
314 Currently, this switch is only used by dwarfout.c; however, it is intended
315 to be a catchall for printing debug information in the assembler file. */
317 int flag_debug_asm = 0;
319 /* -dP causes the rtl to be emitted as a comment in assembly. */
321 int flag_dump_rtl_in_asm = 0;
323 /* When non-NULL, indicates that whenever space is allocated on the
324 stack, the resulting stack pointer must not pass this
325 address---that is, for stacks that grow downward, the stack pointer
326 must always be greater than or equal to this address; for stacks
327 that grow upward, the stack pointer must be less than this address.
328 At present, the rtx may be either a REG or a SYMBOL_REF, although
329 the support provided depends on the backend. */
330 rtx stack_limit_rtx;
332 /* If one, renumber instruction UIDs to reduce the number of
333 unused UIDs if there are a lot of instructions. If greater than
334 one, unconditionally renumber instruction UIDs. */
335 int flag_renumber_insns = 1;
337 /* Nonzero if we should track variables. When
338 flag_var_tracking == AUTODETECT_VALUE it will be set according
339 to optimize, debug_info_level and debug_hooks in process_options (). */
340 int flag_var_tracking = AUTODETECT_VALUE;
342 /* True if the user has tagged the function with the 'section'
343 attribute. */
345 bool user_defined_section_attribute = false;
347 /* Values of the -falign-* flags: how much to align labels in code.
348 0 means `use default', 1 means `don't align'.
349 For each variable, there is an _log variant which is the power
350 of two not less than the variable, for .align output. */
352 int align_loops_log;
353 int align_loops_max_skip;
354 int align_jumps_log;
355 int align_jumps_max_skip;
356 int align_labels_log;
357 int align_labels_max_skip;
358 int align_functions_log;
360 /* Like align_functions_log above, but used by front-ends to force the
361 minimum function alignment. Zero means no alignment is forced. */
362 int force_align_functions_log;
364 typedef struct
366 const char *const string;
367 int *const variable;
368 const int on_value;
370 lang_independent_options;
372 /* Nonzero if subexpressions must be evaluated from left-to-right. */
373 int flag_evaluation_order = 0;
375 /* The user symbol prefix after having resolved same. */
376 const char *user_label_prefix;
378 static const param_info lang_independent_params[] = {
379 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
380 { OPTION, DEFAULT, MIN, MAX, HELP },
381 #include "params.def"
382 #undef DEFPARAM
383 { NULL, 0, 0, 0, NULL }
386 /* Output files for assembler code (real compiler output)
387 and debugging dumps. */
389 FILE *asm_out_file;
390 FILE *aux_info_file;
391 FILE *dump_file = NULL;
392 const char *dump_file_name;
394 /* The current working directory of a translation. It's generally the
395 directory from which compilation was initiated, but a preprocessed
396 file may specify the original directory in which it was
397 created. */
399 static const char *src_pwd;
401 /* Initialize src_pwd with the given string, and return true. If it
402 was already initialized, return false. As a special case, it may
403 be called with a NULL argument to test whether src_pwd has NOT been
404 initialized yet. */
406 bool
407 set_src_pwd (const char *pwd)
409 if (src_pwd)
411 if (strcmp (src_pwd, pwd) == 0)
412 return true;
413 else
414 return false;
417 src_pwd = xstrdup (pwd);
418 return true;
421 /* Return the directory from which the translation unit was initiated,
422 in case set_src_pwd() was not called before to assign it a
423 different value. */
425 const char *
426 get_src_pwd (void)
428 if (! src_pwd)
430 src_pwd = getpwd ();
431 if (!src_pwd)
432 src_pwd = ".";
435 return src_pwd;
438 /* Called when the start of a function definition is parsed,
439 this function prints on stderr the name of the function. */
440 void
441 announce_function (tree decl)
443 if (!quiet_flag)
445 if (rtl_dump_and_exit)
446 fprintf (stderr, "%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
447 else
448 fprintf (stderr, " %s", lang_hooks.decl_printable_name (decl, 2));
449 fflush (stderr);
450 pp_needs_newline (global_dc->printer) = true;
451 diagnostic_set_last_function (global_dc);
455 /* Set up a default flag_random_seed and local_tick, unless the user
456 already specified one. */
458 static void
459 randomize (void)
461 if (!flag_random_seed)
463 unsigned HOST_WIDE_INT value;
464 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
466 /* Get some more or less random data. */
467 #ifdef HAVE_GETTIMEOFDAY
469 struct timeval tv;
471 gettimeofday (&tv, NULL);
472 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
474 #else
476 time_t now = time (NULL);
478 if (now != (time_t)-1)
479 local_tick = (unsigned) now;
481 #endif
482 value = local_tick ^ getpid ();
484 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
485 flag_random_seed = random_seed;
487 else if (!local_tick)
488 local_tick = -1;
492 /* Decode the string P as an integral parameter.
493 If the string is indeed an integer return its numeric value else
494 issue an Invalid Option error for the option PNAME and return DEFVAL.
495 If PNAME is zero just return DEFVAL, do not call error. */
498 read_integral_parameter (const char *p, const char *pname, const int defval)
500 const char *endp = p;
502 while (*endp)
504 if (ISDIGIT (*endp))
505 endp++;
506 else
507 break;
510 if (*endp != 0)
512 if (pname != 0)
513 error ("invalid option argument %qs", pname);
514 return defval;
517 return atoi (p);
520 /* When compiling with a recent enough GCC, we use the GNU C "extern inline"
521 for floor_log2 and exact_log2; see toplev.h. That construct, however,
522 conflicts with the ISO C++ One Definition Rule. */
524 #if GCC_VERSION < 3004 || !defined (__cplusplus)
526 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
527 If X is 0, return -1. */
530 floor_log2 (unsigned HOST_WIDE_INT x)
532 int t = 0;
534 if (x == 0)
535 return -1;
537 #ifdef CLZ_HWI
538 t = HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x);
539 #else
540 if (HOST_BITS_PER_WIDE_INT > 64)
541 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
542 t += 64;
543 if (HOST_BITS_PER_WIDE_INT > 32)
544 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
545 t += 32;
546 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
547 t += 16;
548 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
549 t += 8;
550 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
551 t += 4;
552 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
553 t += 2;
554 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
555 t += 1;
556 #endif
558 return t;
561 /* Return the logarithm of X, base 2, considering X unsigned,
562 if X is a power of 2. Otherwise, returns -1. */
565 exact_log2 (unsigned HOST_WIDE_INT x)
567 if (x != (x & -x))
568 return -1;
569 #ifdef CTZ_HWI
570 return x ? CTZ_HWI (x) : -1;
571 #else
572 return floor_log2 (x);
573 #endif
576 #endif /* GCC_VERSION < 3004 || !defined (__cplusplus) */
578 /* Handler for fatal signals, such as SIGSEGV. These are transformed
579 into ICE messages, which is much more user friendly. In case the
580 error printer crashes, reset the signal to prevent infinite recursion. */
582 static void
583 crash_signal (int signo)
585 signal (signo, SIG_DFL);
587 /* If we crashed while processing an ASM statement, then be a little more
588 graceful. It's most likely the user's fault. */
589 if (this_is_asm_operands)
591 output_operand_lossage ("unrecoverable error");
592 exit (FATAL_EXIT_CODE);
595 internal_error ("%s", strsignal (signo));
598 /* Arrange to dump core on error. (The regular error message is still
599 printed first, except in the case of abort().) */
601 static void
602 setup_core_dumping (void)
604 #ifdef SIGABRT
605 signal (SIGABRT, SIG_DFL);
606 #endif
607 #if defined(HAVE_SETRLIMIT)
609 struct rlimit rlim;
610 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
611 fatal_error ("getting core file size maximum limit: %m");
612 rlim.rlim_cur = rlim.rlim_max;
613 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
614 fatal_error ("setting core file size limit to maximum: %m");
616 #endif
617 diagnostic_abort_on_error (global_dc);
621 /* Strip off a legitimate source ending from the input string NAME of
622 length LEN. Rather than having to know the names used by all of
623 our front ends, we strip off an ending of a period followed by
624 up to five characters. (Java uses ".class".) */
626 void
627 strip_off_ending (char *name, int len)
629 int i;
630 for (i = 2; i < 6 && len > i; i++)
632 if (name[len - i] == '.')
634 name[len - i] = '\0';
635 break;
640 /* Output a quoted string. */
642 void
643 output_quoted_string (FILE *asm_file, const char *string)
645 #ifdef OUTPUT_QUOTED_STRING
646 OUTPUT_QUOTED_STRING (asm_file, string);
647 #else
648 char c;
650 putc ('\"', asm_file);
651 while ((c = *string++) != 0)
653 if (ISPRINT (c))
655 if (c == '\"' || c == '\\')
656 putc ('\\', asm_file);
657 putc (c, asm_file);
659 else
660 fprintf (asm_file, "\\%03o", (unsigned char) c);
662 putc ('\"', asm_file);
663 #endif
666 /* Output a file name in the form wanted by System V. */
668 void
669 output_file_directive (FILE *asm_file, const char *input_name)
671 int len;
672 const char *na;
674 if (input_name == NULL)
675 input_name = "<stdin>";
677 len = strlen (input_name);
678 na = input_name + len;
680 /* NA gets INPUT_NAME sans directory names. */
681 while (na > input_name)
683 if (IS_DIR_SEPARATOR (na[-1]))
684 break;
685 na--;
688 #ifdef ASM_OUTPUT_SOURCE_FILENAME
689 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
690 #else
691 fprintf (asm_file, "\t.file\t");
692 output_quoted_string (asm_file, na);
693 fputc ('\n', asm_file);
694 #endif
697 /* A subroutine of wrapup_global_declarations. We've come to the end of
698 the compilation unit. All deferred variables should be undeferred,
699 and all incomplete decls should be finalized. */
701 void
702 wrapup_global_declaration_1 (tree decl)
704 /* We're not deferring this any longer. Assignment is conditional to
705 avoid needlessly dirtying PCH pages. */
706 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
707 && DECL_DEFER_OUTPUT (decl) != 0)
708 DECL_DEFER_OUTPUT (decl) = 0;
710 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
711 lang_hooks.finish_incomplete_decl (decl);
714 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
715 needs to be output. Return true if it is output. */
717 bool
718 wrapup_global_declaration_2 (tree decl)
720 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
721 return false;
723 /* Don't write out static consts, unless we still need them.
725 We also keep static consts if not optimizing (for debugging),
726 unless the user specified -fno-keep-static-consts.
727 ??? They might be better written into the debug information.
728 This is possible when using DWARF.
730 A language processor that wants static constants to be always
731 written out (even if it is not used) is responsible for
732 calling rest_of_decl_compilation itself. E.g. the C front-end
733 calls rest_of_decl_compilation from finish_decl.
734 One motivation for this is that is conventional in some
735 environments to write things like:
736 static const char rcsid[] = "... version string ...";
737 intending to force the string to be in the executable.
739 A language processor that would prefer to have unneeded
740 static constants "optimized away" would just defer writing
741 them out until here. E.g. C++ does this, because static
742 constants are often defined in header files.
744 ??? A tempting alternative (for both C and C++) would be
745 to force a constant to be written if and only if it is
746 defined in a main file, as opposed to an include file. */
748 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
750 struct cgraph_varpool_node *node;
751 bool needed = true;
752 node = cgraph_varpool_node (decl);
754 if (node->finalized)
755 needed = false;
756 else if (node->alias)
757 needed = false;
758 else if (!cgraph_global_info_ready
759 && (TREE_USED (decl)
760 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
761 /* needed */;
762 else if (node->needed)
763 /* needed */;
764 else if (DECL_COMDAT (decl))
765 needed = false;
766 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
767 && (optimize || !flag_keep_static_consts
768 || DECL_ARTIFICIAL (decl)))
769 needed = false;
771 if (needed)
773 rest_of_decl_compilation (decl, 1, 1);
774 return true;
778 return false;
781 /* Do any final processing required for the declarations in VEC, of
782 which there are LEN. We write out inline functions and variables
783 that have been deferred until this point, but which are required.
784 Returns nonzero if anything was put out. */
786 bool
787 wrapup_global_declarations (tree *vec, int len)
789 bool reconsider, output_something = false;
790 int i;
792 for (i = 0; i < len; i++)
793 wrapup_global_declaration_1 (vec[i]);
795 /* Now emit any global variables or functions that we have been
796 putting off. We need to loop in case one of the things emitted
797 here references another one which comes earlier in the list. */
800 reconsider = false;
801 for (i = 0; i < len; i++)
802 reconsider |= wrapup_global_declaration_2 (vec[i]);
803 if (reconsider)
804 output_something = true;
806 while (reconsider);
808 return output_something;
811 /* A subroutine of check_global_declarations. Issue appropriate warnings
812 for the global declaration DECL. */
814 void
815 check_global_declaration_1 (tree decl)
817 /* Warn about any function declared static but not defined. We don't
818 warn about variables, because many programs have static variables
819 that exist only to get some text into the object file. */
820 if (TREE_CODE (decl) == FUNCTION_DECL
821 && DECL_INITIAL (decl) == 0
822 && DECL_EXTERNAL (decl)
823 && ! DECL_ARTIFICIAL (decl)
824 && ! TREE_NO_WARNING (decl)
825 && ! TREE_PUBLIC (decl)
826 && (warn_unused_function
827 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
829 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
830 pedwarn ("%q+F used but never defined", decl);
831 else
832 warning (0, "%q+F declared %<static%> but never defined", decl);
833 /* This symbol is effectively an "extern" declaration now. */
834 TREE_PUBLIC (decl) = 1;
835 assemble_external (decl);
838 /* Warn about static fns or vars defined but not used. */
839 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
840 /* We don't warn about "static const" variables because the
841 "rcs_id" idiom uses that construction. */
842 || (warn_unused_variable
843 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
844 && ! DECL_IN_SYSTEM_HEADER (decl)
845 && ! TREE_USED (decl)
846 /* The TREE_USED bit for file-scope decls is kept in the identifier,
847 to handle multiple external decls in different scopes. */
848 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
849 && ! DECL_EXTERNAL (decl)
850 && ! TREE_PUBLIC (decl)
851 /* A volatile variable might be used in some non-obvious way. */
852 && ! TREE_THIS_VOLATILE (decl)
853 /* Global register variables must be declared to reserve them. */
854 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
855 /* Otherwise, ask the language. */
856 && lang_hooks.decls.warn_unused_global (decl))
857 warning (0, "%q+D defined but not used", decl);
860 /* Issue appropriate warnings for the global declarations in VEC (of
861 which there are LEN). */
863 void
864 check_global_declarations (tree *vec, int len)
866 int i;
868 for (i = 0; i < len; i++)
869 check_global_declaration_1 (vec[i]);
872 /* Emit debugging information for all global declarations in VEC. */
874 void
875 emit_debug_global_declarations (tree *vec, int len)
877 int i;
879 /* Avoid confusing the debug information machinery when there are errors. */
880 if (errorcount != 0 || sorrycount != 0)
881 return;
883 timevar_push (TV_SYMOUT);
884 for (i = 0; i < len; i++)
885 debug_hooks->global_decl (vec[i]);
886 timevar_pop (TV_SYMOUT);
889 /* Warn about a use of an identifier which was marked deprecated. */
890 void
891 warn_deprecated_use (tree node)
893 if (node == 0 || !warn_deprecated_decl)
894 return;
896 if (DECL_P (node))
898 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
899 warning (OPT_Wdeprecated_declarations,
900 "%qs is deprecated (declared at %s:%d)",
901 IDENTIFIER_POINTER (DECL_NAME (node)),
902 xloc.file, xloc.line);
904 else if (TYPE_P (node))
906 const char *what = NULL;
907 tree decl = TYPE_STUB_DECL (node);
909 if (TYPE_NAME (node))
911 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
912 what = IDENTIFIER_POINTER (TYPE_NAME (node));
913 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
914 && DECL_NAME (TYPE_NAME (node)))
915 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
918 if (decl)
920 expanded_location xloc
921 = expand_location (DECL_SOURCE_LOCATION (decl));
922 if (what)
923 warning (OPT_Wdeprecated_declarations,
924 "%qs is deprecated (declared at %s:%d)", what,
925 xloc.file, xloc.line);
926 else
927 warning (OPT_Wdeprecated_declarations,
928 "type is deprecated (declared at %s:%d)",
929 xloc.file, xloc.line);
931 else
933 if (what)
934 warning (OPT_Wdeprecated_declarations, "%qs is deprecated", what);
935 else
936 warning (OPT_Wdeprecated_declarations, "type is deprecated");
941 /* Save the current INPUT_LOCATION on the top entry in the
942 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
943 INPUT_LOCATION accordingly. */
945 void
946 #ifdef USE_MAPPED_LOCATION
947 push_srcloc (location_t fline)
948 #else
949 push_srcloc (const char *file, int line)
950 #endif
952 struct file_stack *fs;
954 fs = XNEW (struct file_stack);
955 fs->location = input_location;
956 fs->next = input_file_stack;
957 #ifdef USE_MAPPED_LOCATION
958 input_location = fline;
959 #else
960 input_filename = file;
961 input_line = line;
962 #endif
963 input_file_stack = fs;
964 input_file_stack_tick++;
967 /* Pop the top entry off the stack of presently open source files.
968 Restore the INPUT_LOCATION from the new topmost entry on the
969 stack. */
971 void
972 pop_srcloc (void)
974 struct file_stack *fs;
976 fs = input_file_stack;
977 input_location = fs->location;
978 input_file_stack = fs->next;
979 free (fs);
980 input_file_stack_tick++;
983 /* Compile an entire translation unit. Write a file of assembly
984 output and various debugging dumps. */
986 static void
987 compile_file (void)
989 /* Initialize yet another pass. */
991 init_cgraph ();
992 init_final (main_input_filename);
993 coverage_init (aux_base_name);
995 timevar_push (TV_PARSE);
997 /* Call the parser, which parses the entire file (calling
998 rest_of_compilation for each function). */
999 lang_hooks.parse_file (set_yydebug);
1001 /* In case there were missing block closers,
1002 get us back to the global binding level. */
1003 lang_hooks.clear_binding_stack ();
1005 /* Compilation is now finished except for writing
1006 what's left of the symbol table output. */
1007 timevar_pop (TV_PARSE);
1009 if (flag_syntax_only || errorcount || sorrycount)
1010 return;
1012 lang_hooks.decls.final_write_globals ();
1013 cgraph_varpool_assemble_pending_decls ();
1014 finish_aliases_2 ();
1016 /* This must occur after the loop to output deferred functions.
1017 Else the coverage initializer would not be emitted if all the
1018 functions in this compilation unit were deferred. */
1019 coverage_finish ();
1021 /* Likewise for mudflap static object registrations. */
1022 if (flag_mudflap)
1023 mudflap_finish_file ();
1025 output_shared_constant_pool ();
1026 output_object_blocks ();
1028 /* Write out any pending weak symbol declarations. */
1030 weak_finish ();
1032 /* Do dbx symbols. */
1033 timevar_push (TV_SYMOUT);
1035 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1036 if (dwarf2out_do_frame ())
1037 dwarf2out_frame_finish ();
1038 #endif
1040 (*debug_hooks->finish) (main_input_filename);
1041 timevar_pop (TV_SYMOUT);
1043 /* Output some stuff at end of file if nec. */
1045 dw2_output_indirect_constants ();
1047 /* Flush any pending external directives. cgraph did this for
1048 assemble_external calls from the front end, but the RTL
1049 expander can also generate them. */
1050 process_pending_assemble_externals ();
1052 /* Attach a special .ident directive to the end of the file to identify
1053 the version of GCC which compiled this code. The format of the .ident
1054 string is patterned after the ones produced by native SVR4 compilers. */
1055 #ifdef IDENT_ASM_OP
1056 if (!flag_no_ident)
1057 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1058 IDENT_ASM_OP, version_string);
1059 #endif
1061 /* This must be at the end. Some target ports emit end of file directives
1062 into the assembly file here, and hence we can not output anything to the
1063 assembly file after this point. */
1064 targetm.asm_out.file_end ();
1067 /* Parse a -d... command line switch. */
1069 void
1070 decode_d_option (const char *arg)
1072 int c;
1074 while (*arg)
1075 switch (c = *arg++)
1077 case 'A':
1078 flag_debug_asm = 1;
1079 break;
1080 case 'p':
1081 flag_print_asm_name = 1;
1082 break;
1083 case 'P':
1084 flag_dump_rtl_in_asm = 1;
1085 flag_print_asm_name = 1;
1086 break;
1087 case 'v':
1088 graph_dump_format = vcg;
1089 break;
1090 case 'x':
1091 rtl_dump_and_exit = 1;
1092 break;
1093 case 'y':
1094 set_yydebug = 1;
1095 break;
1096 case 'D': /* These are handled by the preprocessor. */
1097 case 'I':
1098 break;
1099 case 'H':
1100 setup_core_dumping();
1101 break;
1103 case 'a':
1104 default:
1105 if (!enable_rtl_dump_file (c))
1106 warning (0, "unrecognized gcc debugging option: %c", c);
1107 break;
1111 /* Indexed by enum debug_info_type. */
1112 const char *const debug_type_names[] =
1114 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1117 /* Print version information to FILE.
1118 Each line begins with INDENT (for the case where FILE is the
1119 assembler output file). */
1121 void
1122 print_version (FILE *file, const char *indent)
1124 static const char fmt1[] =
1125 #ifdef __GNUC__
1126 N_("%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n")
1127 #else
1128 N_("%s%s%s version %s (%s) compiled by CC.\n")
1129 #endif
1131 static const char fmt2[] =
1132 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1133 #ifndef __VERSION__
1134 #define __VERSION__ "[?]"
1135 #endif
1136 fprintf (file,
1137 file == stderr ? _(fmt1) : fmt1,
1138 indent, *indent != 0 ? " " : "",
1139 lang_hooks.name, version_string, TARGET_NAME,
1140 indent, __VERSION__);
1141 fprintf (file,
1142 file == stderr ? _(fmt2) : fmt2,
1143 indent, *indent != 0 ? " " : "",
1144 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1147 /* Print an option value and return the adjusted position in the line.
1148 ??? We don't handle error returns from fprintf (disk full); presumably
1149 other code will catch a disk full though. */
1151 static int
1152 print_single_switch (FILE *file, int pos, int max,
1153 const char *indent, const char *sep, const char *term,
1154 const char *type, const char *name)
1156 /* The ultrix fprintf returns 0 on success, so compute the result we want
1157 here since we need it for the following test. */
1158 int len = strlen (sep) + strlen (type) + strlen (name);
1160 if (pos != 0
1161 && pos + len > max)
1163 fprintf (file, "%s", term);
1164 pos = 0;
1166 if (pos == 0)
1168 fprintf (file, "%s", indent);
1169 pos = strlen (indent);
1171 fprintf (file, "%s%s%s", sep, type, name);
1172 pos += len;
1173 return pos;
1176 /* Print active target switches to FILE.
1177 POS is the current cursor position and MAX is the size of a "line".
1178 Each line begins with INDENT and ends with TERM.
1179 Each switch is separated from the next by SEP. */
1181 static void
1182 print_switch_values (FILE *file, int pos, int max,
1183 const char *indent, const char *sep, const char *term)
1185 size_t j;
1186 const char **p;
1188 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1189 that it can be printed below. This helps reproducibility. */
1190 randomize ();
1192 /* Print the options as passed. */
1193 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1194 _("options passed: "), "");
1196 for (p = &save_argv[1]; *p != NULL; p++)
1197 if (**p == '-')
1199 /* Ignore these. */
1200 if (strcmp (*p, "-o") == 0)
1202 if (p[1] != NULL)
1203 p++;
1204 continue;
1206 if (strcmp (*p, "-quiet") == 0)
1207 continue;
1208 if (strcmp (*p, "-version") == 0)
1209 continue;
1210 if ((*p)[1] == 'd')
1211 continue;
1213 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1215 if (pos > 0)
1216 fprintf (file, "%s", term);
1218 /* Print the -f and -m options that have been enabled.
1219 We don't handle language specific options but printing argv
1220 should suffice. */
1222 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1223 _("options enabled: "), "");
1225 for (j = 0; j < cl_options_count; j++)
1226 if ((cl_options[j].flags & CL_REPORT)
1227 && option_enabled (j) > 0)
1228 pos = print_single_switch (file, pos, max, indent, sep, term,
1229 "", cl_options[j].opt_text);
1231 fprintf (file, "%s", term);
1234 /* Open assembly code output file. Do this even if -fsyntax-only is
1235 on, because then the driver will have provided the name of a
1236 temporary file or bit bucket for us. NAME is the file specified on
1237 the command line, possibly NULL. */
1238 static void
1239 init_asm_output (const char *name)
1241 if (name == NULL && asm_file_name == 0)
1242 asm_out_file = stdout;
1243 else
1245 if (asm_file_name == 0)
1247 int len = strlen (dump_base_name);
1248 char *dumpname = XNEWVEC (char, len + 6);
1249 memcpy (dumpname, dump_base_name, len + 1);
1250 strip_off_ending (dumpname, len);
1251 strcat (dumpname, ".s");
1252 asm_file_name = dumpname;
1254 if (!strcmp (asm_file_name, "-"))
1255 asm_out_file = stdout;
1256 else
1257 asm_out_file = fopen (asm_file_name, "w+b");
1258 if (asm_out_file == 0)
1259 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1262 if (!flag_syntax_only)
1264 targetm.asm_out.file_start ();
1266 #ifdef ASM_COMMENT_START
1267 if (flag_verbose_asm)
1269 /* Print the list of options in effect. */
1270 print_version (asm_out_file, ASM_COMMENT_START);
1271 print_switch_values (asm_out_file, 0, MAX_LINE,
1272 ASM_COMMENT_START, " ", "\n");
1273 /* Add a blank line here so it appears in assembler output but not
1274 screen output. */
1275 fprintf (asm_out_file, "\n");
1277 #endif
1281 /* Return true if the state of option OPTION should be stored in PCH files
1282 and checked by default_pch_valid_p. Store the option's current state
1283 in STATE if so. */
1285 static inline bool
1286 option_affects_pch_p (int option, struct cl_option_state *state)
1288 if ((cl_options[option].flags & CL_TARGET) == 0)
1289 return false;
1290 if (cl_options[option].flag_var == &target_flags)
1291 if (targetm.check_pch_target_flags)
1292 return false;
1293 return get_option_state (option, state);
1296 /* Default version of get_pch_validity.
1297 By default, every flag difference is fatal; that will be mostly right for
1298 most targets, but completely right for very few. */
1300 void *
1301 default_get_pch_validity (size_t *len)
1303 struct cl_option_state state;
1304 size_t i;
1305 char *result, *r;
1307 *len = 2;
1308 if (targetm.check_pch_target_flags)
1309 *len += sizeof (target_flags);
1310 for (i = 0; i < cl_options_count; i++)
1311 if (option_affects_pch_p (i, &state))
1312 *len += state.size;
1314 result = r = XNEWVEC (char, *len);
1315 r[0] = flag_pic;
1316 r[1] = flag_pie;
1317 r += 2;
1318 if (targetm.check_pch_target_flags)
1320 memcpy (r, &target_flags, sizeof (target_flags));
1321 r += sizeof (target_flags);
1324 for (i = 0; i < cl_options_count; i++)
1325 if (option_affects_pch_p (i, &state))
1327 memcpy (r, state.data, state.size);
1328 r += state.size;
1331 return result;
1334 /* Return a message which says that a PCH file was created with a different
1335 setting of OPTION. */
1337 static const char *
1338 pch_option_mismatch (const char *option)
1340 char *r;
1342 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1343 if (r == NULL)
1344 return _("out of memory");
1345 return r;
1348 /* Default version of pch_valid_p. */
1350 const char *
1351 default_pch_valid_p (const void *data_p, size_t len)
1353 struct cl_option_state state;
1354 const char *data = (const char *)data_p;
1355 size_t i;
1357 /* -fpic and -fpie also usually make a PCH invalid. */
1358 if (data[0] != flag_pic)
1359 return _("created and used with different settings of -fpic");
1360 if (data[1] != flag_pie)
1361 return _("created and used with different settings of -fpie");
1362 data += 2;
1364 /* Check target_flags. */
1365 if (targetm.check_pch_target_flags)
1367 int tf;
1368 const char *r;
1370 memcpy (&tf, data, sizeof (target_flags));
1371 data += sizeof (target_flags);
1372 len -= sizeof (target_flags);
1373 r = targetm.check_pch_target_flags (tf);
1374 if (r != NULL)
1375 return r;
1378 for (i = 0; i < cl_options_count; i++)
1379 if (option_affects_pch_p (i, &state))
1381 if (memcmp (data, state.data, state.size) != 0)
1382 return pch_option_mismatch (cl_options[i].opt_text);
1383 data += state.size;
1384 len -= state.size;
1387 return NULL;
1390 /* Default tree printer. Handles declarations only. */
1391 static bool
1392 default_tree_printer (pretty_printer * pp, text_info *text, const char *spec,
1393 int precision, bool wide, bool set_locus, bool hash)
1395 tree t;
1397 /* FUTURE: %+x should set the locus. */
1398 if (precision != 0 || wide || hash)
1399 return false;
1401 switch (*spec)
1403 case 'D':
1404 t = va_arg (*text->args_ptr, tree);
1405 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1406 t = DECL_DEBUG_EXPR (t);
1407 break;
1409 case 'F':
1410 case 'T':
1411 t = va_arg (*text->args_ptr, tree);
1412 break;
1414 default:
1415 return false;
1418 if (set_locus && text->locus)
1419 *text->locus = DECL_SOURCE_LOCATION (t);
1421 if (DECL_P (t))
1423 const char *n = DECL_NAME (t)
1424 ? lang_hooks.decl_printable_name (t, 2)
1425 : "<anonymous>";
1426 pp_string (pp, n);
1428 else
1429 dump_generic_node (pp, t, 0, 0, 0);
1431 return true;
1434 /* Initialization of the front end environment, before command line
1435 options are parsed. Signal handlers, internationalization etc.
1436 ARGV0 is main's argv[0]. */
1437 static void
1438 general_init (const char *argv0)
1440 const char *p;
1442 p = argv0 + strlen (argv0);
1443 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1444 --p;
1445 progname = p;
1447 xmalloc_set_program_name (progname);
1449 hex_init ();
1451 /* Unlock the stdio streams. */
1452 unlock_std_streams ();
1454 gcc_init_libintl ();
1456 /* Initialize the diagnostics reporting machinery, so option parsing
1457 can give warnings and errors. */
1458 diagnostic_initialize (global_dc);
1459 /* Set a default printer. Language specific initializations will
1460 override it later. */
1461 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1463 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1464 #ifdef SIGSEGV
1465 signal (SIGSEGV, crash_signal);
1466 #endif
1467 #ifdef SIGILL
1468 signal (SIGILL, crash_signal);
1469 #endif
1470 #ifdef SIGBUS
1471 signal (SIGBUS, crash_signal);
1472 #endif
1473 #ifdef SIGABRT
1474 signal (SIGABRT, crash_signal);
1475 #endif
1476 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1477 signal (SIGIOT, crash_signal);
1478 #endif
1479 #ifdef SIGFPE
1480 signal (SIGFPE, crash_signal);
1481 #endif
1483 /* Other host-specific signal setup. */
1484 (*host_hooks.extra_signals)();
1486 /* Initialize the garbage-collector, string pools and tree type hash
1487 table. */
1488 init_ggc ();
1489 init_stringpool ();
1490 linemap_init (&line_table);
1491 init_ttree ();
1493 /* Initialize register usage now so switches may override. */
1494 init_reg_sets ();
1496 /* Register the language-independent parameters. */
1497 add_params (lang_independent_params, LAST_PARAM);
1499 /* This must be done after add_params but before argument processing. */
1500 init_ggc_heuristics();
1501 init_optimization_passes ();
1504 /* Return true if the current target supports -fsection-anchors. */
1506 static bool
1507 target_supports_section_anchors_p (void)
1509 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1510 return false;
1512 if (targetm.asm_out.output_anchor == NULL)
1513 return false;
1515 return true;
1518 /* Process the options that have been parsed. */
1519 static void
1520 process_options (void)
1522 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1523 This can happen with incorrect pre-processed input. */
1524 debug_hooks = &do_nothing_debug_hooks;
1526 /* Allow the front end to perform consistency checks and do further
1527 initialization based on the command line options. This hook also
1528 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1529 so we can correctly initialize debug output. */
1530 no_backend = lang_hooks.post_options (&main_input_filename);
1531 #ifndef USE_MAPPED_LOCATION
1532 input_filename = main_input_filename;
1533 #endif
1535 #ifdef OVERRIDE_OPTIONS
1536 /* Some machines may reject certain combinations of options. */
1537 OVERRIDE_OPTIONS;
1538 #endif
1540 if (flag_section_anchors && !target_supports_section_anchors_p ())
1542 warning (OPT_fsection_anchors,
1543 "this target does not support %qs", "-fsection-anchors");
1544 flag_section_anchors = 0;
1547 if (flag_short_enums == 2)
1548 flag_short_enums = targetm.default_short_enums ();
1550 /* Set aux_base_name if not already set. */
1551 if (aux_base_name)
1553 else if (main_input_filename)
1555 char *name = xstrdup (lbasename (main_input_filename));
1557 strip_off_ending (name, strlen (name));
1558 aux_base_name = name;
1560 else
1561 aux_base_name = "gccaux";
1563 /* Set up the align_*_log variables, defaulting them to 1 if they
1564 were still unset. */
1565 if (align_loops <= 0) align_loops = 1;
1566 if (align_loops_max_skip > align_loops || !align_loops)
1567 align_loops_max_skip = align_loops - 1;
1568 align_loops_log = floor_log2 (align_loops * 2 - 1);
1569 if (align_jumps <= 0) align_jumps = 1;
1570 if (align_jumps_max_skip > align_jumps || !align_jumps)
1571 align_jumps_max_skip = align_jumps - 1;
1572 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1573 if (align_labels <= 0) align_labels = 1;
1574 align_labels_log = floor_log2 (align_labels * 2 - 1);
1575 if (align_labels_max_skip > align_labels || !align_labels)
1576 align_labels_max_skip = align_labels - 1;
1577 if (align_functions <= 0) align_functions = 1;
1578 align_functions_log = floor_log2 (align_functions * 2 - 1);
1580 /* Unrolling all loops implies that standard loop unrolling must also
1581 be done. */
1582 if (flag_unroll_all_loops)
1583 flag_unroll_loops = 1;
1585 /* The loop unrolling code assumes that cse will be run after loop.
1586 web and rename-registers also help when run after loop unrolling. */
1588 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1589 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1590 if (flag_web == AUTODETECT_VALUE)
1591 flag_web = flag_unroll_loops || flag_peel_loops;
1592 if (flag_rename_registers == AUTODETECT_VALUE)
1593 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1595 if (flag_non_call_exceptions)
1596 flag_asynchronous_unwind_tables = 1;
1597 if (flag_asynchronous_unwind_tables)
1598 flag_unwind_tables = 1;
1600 /* Disable unit-at-a-time mode for frontends not supporting callgraph
1601 interface. */
1602 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
1603 flag_unit_at_a_time = 0;
1605 if (!flag_unit_at_a_time)
1606 flag_section_anchors = 0;
1608 if (flag_value_profile_transformations)
1609 flag_profile_values = 1;
1611 /* Warn about options that are not supported on this machine. */
1612 #ifndef INSN_SCHEDULING
1613 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1614 warning (0, "instruction scheduling not supported on this target machine");
1615 #endif
1616 #ifndef DELAY_SLOTS
1617 if (flag_delayed_branch)
1618 warning (0, "this target machine does not have delayed branches");
1619 #endif
1621 user_label_prefix = USER_LABEL_PREFIX;
1622 if (flag_leading_underscore != -1)
1624 /* If the default prefix is more complicated than "" or "_",
1625 issue a warning and ignore this option. */
1626 if (user_label_prefix[0] == 0 ||
1627 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1629 user_label_prefix = flag_leading_underscore ? "_" : "";
1631 else
1632 warning (0, "-f%sleading-underscore not supported on this target machine",
1633 flag_leading_underscore ? "" : "no-");
1636 /* If we are in verbose mode, write out the version and maybe all the
1637 option flags in use. */
1638 if (version_flag)
1640 print_version (stderr, "");
1641 if (! quiet_flag)
1642 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
1645 if (flag_syntax_only)
1647 write_symbols = NO_DEBUG;
1648 profile_flag = 0;
1651 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1652 level is 0. */
1653 if (debug_info_level == DINFO_LEVEL_NONE)
1654 write_symbols = NO_DEBUG;
1656 /* Now we know write_symbols, set up the debug hooks based on it.
1657 By default we do nothing for debug output. */
1658 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1659 default_debug_hooks = &do_nothing_debug_hooks;
1660 #if defined(DBX_DEBUGGING_INFO)
1661 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1662 default_debug_hooks = &dbx_debug_hooks;
1663 #endif
1664 #if defined(XCOFF_DEBUGGING_INFO)
1665 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1666 default_debug_hooks = &xcoff_debug_hooks;
1667 #endif
1668 #ifdef SDB_DEBUGGING_INFO
1669 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1670 default_debug_hooks = &sdb_debug_hooks;
1671 #endif
1672 #ifdef DWARF2_DEBUGGING_INFO
1673 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1674 default_debug_hooks = &dwarf2_debug_hooks;
1675 #endif
1676 #ifdef VMS_DEBUGGING_INFO
1677 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1678 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1679 default_debug_hooks = &vmsdbg_debug_hooks;
1680 #endif
1682 if (write_symbols == NO_DEBUG)
1684 #if defined(DBX_DEBUGGING_INFO)
1685 else if (write_symbols == DBX_DEBUG)
1686 debug_hooks = &dbx_debug_hooks;
1687 #endif
1688 #if defined(XCOFF_DEBUGGING_INFO)
1689 else if (write_symbols == XCOFF_DEBUG)
1690 debug_hooks = &xcoff_debug_hooks;
1691 #endif
1692 #ifdef SDB_DEBUGGING_INFO
1693 else if (write_symbols == SDB_DEBUG)
1694 debug_hooks = &sdb_debug_hooks;
1695 #endif
1696 #ifdef DWARF2_DEBUGGING_INFO
1697 else if (write_symbols == DWARF2_DEBUG)
1698 debug_hooks = &dwarf2_debug_hooks;
1699 #endif
1700 #ifdef VMS_DEBUGGING_INFO
1701 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1702 debug_hooks = &vmsdbg_debug_hooks;
1703 #endif
1704 else
1705 error ("target system does not support the \"%s\" debug format",
1706 debug_type_names[write_symbols]);
1708 /* Now we know which debug output will be used so we can set
1709 flag_var_tracking, flag_rename_registers if the user has
1710 not specified them. */
1711 if (debug_info_level < DINFO_LEVEL_NORMAL
1712 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1714 if (flag_var_tracking == 1)
1716 if (debug_info_level < DINFO_LEVEL_NORMAL)
1717 warning (0, "variable tracking requested, but useless unless "
1718 "producing debug info");
1719 else
1720 warning (0, "variable tracking requested, but not supported "
1721 "by this debug format");
1723 flag_var_tracking = 0;
1726 if (flag_rename_registers == AUTODETECT_VALUE)
1727 flag_rename_registers = default_debug_hooks->var_location
1728 != do_nothing_debug_hooks.var_location;
1730 if (flag_var_tracking == AUTODETECT_VALUE)
1731 flag_var_tracking = optimize >= 1;
1733 /* If auxiliary info generation is desired, open the output file.
1734 This goes in the same directory as the source file--unlike
1735 all the other output files. */
1736 if (flag_gen_aux_info)
1738 aux_info_file = fopen (aux_info_file_name, "w");
1739 if (aux_info_file == 0)
1740 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1743 if (! targetm.have_named_sections)
1745 if (flag_function_sections)
1747 warning (0, "-ffunction-sections not supported for this target");
1748 flag_function_sections = 0;
1750 if (flag_data_sections)
1752 warning (0, "-fdata-sections not supported for this target");
1753 flag_data_sections = 0;
1757 if (flag_function_sections && profile_flag)
1759 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1760 flag_function_sections = 0;
1763 #ifndef HAVE_prefetch
1764 if (flag_prefetch_loop_arrays)
1766 warning (0, "-fprefetch-loop-arrays not supported for this target");
1767 flag_prefetch_loop_arrays = 0;
1769 #else
1770 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1772 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1773 flag_prefetch_loop_arrays = 0;
1775 #endif
1777 /* This combination of options isn't handled for i386 targets and doesn't
1778 make much sense anyway, so don't allow it. */
1779 if (flag_prefetch_loop_arrays && optimize_size)
1781 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1782 flag_prefetch_loop_arrays = 0;
1785 #ifndef OBJECT_FORMAT_ELF
1786 #ifndef OBJECT_FORMAT_MACHO
1787 if (flag_function_sections && write_symbols != NO_DEBUG)
1788 warning (0, "-ffunction-sections may affect debugging on some targets");
1789 #endif
1790 #endif
1792 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1793 if (flag_signaling_nans)
1794 flag_trapping_math = 1;
1796 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1797 if (flag_cx_limited_range)
1798 flag_complex_method = 0;
1800 /* Targets must be able to place spill slots at lower addresses. If the
1801 target already uses a soft frame pointer, the transition is trivial. */
1802 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1804 warning (0, "-fstack-protector not supported for this target");
1805 flag_stack_protect = 0;
1807 if (!flag_stack_protect)
1808 warn_stack_protect = 0;
1810 /* ??? Unwind info is not correct around the CFG unless either a frame
1811 pointer is present or A_O_A is set. Fixing this requires rewriting
1812 unwind info generation to be aware of the CFG and propagating states
1813 around edges. */
1814 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1815 && flag_omit_frame_pointer)
1817 warning (0, "unwind tables currently requires a frame pointer "
1818 "for correctness");
1819 flag_omit_frame_pointer = 0;
1823 /* Initialize the compiler back end. */
1824 static void
1825 backend_init (void)
1827 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
1828 || debug_info_level == DINFO_LEVEL_VERBOSE
1829 #ifdef VMS_DEBUGGING_INFO
1830 /* Enable line number info for traceback. */
1831 || debug_info_level > DINFO_LEVEL_NONE
1832 #endif
1833 || flag_test_coverage);
1835 init_rtlanal ();
1836 init_regs ();
1837 init_fake_stack_mems ();
1838 init_alias_once ();
1839 init_reload ();
1840 init_varasm_once ();
1842 /* The following initialization functions need to generate rtl, so
1843 provide a dummy function context for them. */
1844 init_dummy_function_start ();
1845 init_expmed ();
1846 if (flag_caller_saves)
1847 init_caller_save ();
1848 expand_dummy_function_end ();
1851 /* Language-dependent initialization. Returns nonzero on success. */
1852 static int
1853 lang_dependent_init (const char *name)
1855 location_t save_loc = input_location;
1856 if (dump_base_name == 0)
1857 dump_base_name = name && name[0] ? name : "gccdump";
1859 /* Other front-end initialization. */
1860 #ifdef USE_MAPPED_LOCATION
1861 input_location = BUILTINS_LOCATION;
1862 #else
1863 input_filename = "<built-in>";
1864 input_line = 0;
1865 #endif
1866 if (lang_hooks.init () == 0)
1867 return 0;
1868 input_location = save_loc;
1870 init_asm_output (name);
1872 /* These create various _DECL nodes, so need to be called after the
1873 front end is initialized. */
1874 init_eh ();
1875 init_optabs ();
1877 /* The following initialization functions need to generate rtl, so
1878 provide a dummy function context for them. */
1879 init_dummy_function_start ();
1880 init_expr_once ();
1881 expand_dummy_function_end ();
1883 /* If dbx symbol table desired, initialize writing it and output the
1884 predefined types. */
1885 timevar_push (TV_SYMOUT);
1887 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1888 if (dwarf2out_do_frame ())
1889 dwarf2out_frame_init ();
1890 #endif
1892 /* Now we have the correct original filename, we can initialize
1893 debug output. */
1894 (*debug_hooks->init) (name);
1896 timevar_pop (TV_SYMOUT);
1898 return 1;
1901 /* Clean up: close opened files, etc. */
1903 static void
1904 finalize (void)
1906 /* Close the dump files. */
1907 if (flag_gen_aux_info)
1909 fclose (aux_info_file);
1910 if (errorcount)
1911 unlink (aux_info_file_name);
1914 /* Close non-debugging input and output files. Take special care to note
1915 whether fclose returns an error, since the pages might still be on the
1916 buffer chain while the file is open. */
1918 if (asm_out_file)
1920 if (ferror (asm_out_file) != 0)
1921 fatal_error ("error writing to %s: %m", asm_file_name);
1922 if (fclose (asm_out_file) != 0)
1923 fatal_error ("error closing %s: %m", asm_file_name);
1926 finish_optimization_passes ();
1928 if (mem_report)
1930 ggc_print_statistics ();
1931 stringpool_statistics ();
1932 dump_tree_statistics ();
1933 dump_rtx_statistics ();
1934 dump_varray_statistics ();
1935 dump_alloc_pool_statistics ();
1936 dump_ggc_loc_statistics ();
1939 /* Free up memory for the benefit of leak detectors. */
1940 free_reg_info ();
1942 /* Language-specific end of compilation actions. */
1943 lang_hooks.finish ();
1946 /* Initialize the compiler, and compile the input file. */
1947 static void
1948 do_compile (void)
1950 /* Initialize timing first. The C front ends read the main file in
1951 the post_options hook, and C++ does file timings. */
1952 if (time_report || !quiet_flag || flag_detailed_statistics)
1953 timevar_init ();
1954 timevar_start (TV_TOTAL);
1956 process_options ();
1958 /* Don't do any more if an error has already occurred. */
1959 if (!errorcount)
1961 /* This must be run always, because it is needed to compute the FP
1962 predefined macros, such as __LDBL_MAX__, for targets using non
1963 default FP formats. */
1964 init_adjust_machine_modes ();
1966 /* Set up the back-end if requested. */
1967 if (!no_backend)
1968 backend_init ();
1970 /* Language-dependent initialization. Returns true on success. */
1971 if (lang_dependent_init (main_input_filename))
1972 compile_file ();
1974 finalize ();
1977 /* Stop timing and print the times. */
1978 timevar_stop (TV_TOTAL);
1979 timevar_print (stderr);
1982 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1983 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1984 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1986 It is not safe to call this function more than once. */
1989 toplev_main (unsigned int argc, const char **argv)
1991 save_argv = argv;
1993 /* Initialization of GCC's environment, and diagnostics. */
1994 general_init (argv[0]);
1996 /* Parse the options and do minimal processing; basically just
1997 enough to default flags appropriately. */
1998 decode_options (argc, argv);
2000 randomize ();
2002 /* Exit early if we can (e.g. -help). */
2003 if (!exit_after_options)
2004 do_compile ();
2006 if (errorcount || sorrycount)
2007 return (FATAL_EXIT_CODE);
2009 return (SUCCESS_EXIT_CODE);