* cgraphunit.c, config/arm/arm.c, config/m68k/m68k.c,
[official-gcc.git] / gcc / toplev.c
blobcf95f02c94eefd693e28178c01177e6ee0f09566
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 /* Nonzero to dump debug info whilst parsing (-dy option). */
116 static int set_yydebug;
118 /* True if we don't need a backend (e.g. preprocessing only). */
119 static bool no_backend;
121 /* Length of line when printing switch values. */
122 #define MAX_LINE 75
124 /* Name of program invoked, sans directories. */
126 const char *progname;
128 /* Copy of argument vector to toplev_main. */
129 static const char **save_argv;
131 /* Name of top-level original source file (what was input to cpp).
132 This comes from the #-command at the beginning of the actual input.
133 If there isn't any there, then this is the cc1 input file name. */
135 const char *main_input_filename;
137 #ifndef USE_MAPPED_LOCATION
138 location_t unknown_location = { NULL, 0 };
139 #endif
141 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
142 to optimize and default_debug_hooks in process_options (). */
143 #define AUTODETECT_VALUE 2
145 /* Current position in real source file. */
147 location_t input_location;
149 struct line_maps line_table;
151 /* Nonzero if it is unsafe to create any new pseudo registers. */
152 int no_new_pseudos;
154 /* Stack of currently pending input files. */
156 struct file_stack *input_file_stack;
158 /* Incremented on each change to input_file_stack. */
159 int input_file_stack_tick;
161 /* Record of input_file_stack at each tick. */
162 typedef struct file_stack *fs_p;
163 DEF_VEC_P(fs_p);
164 DEF_VEC_ALLOC_P(fs_p,heap);
165 static VEC(fs_p,heap) *input_file_stack_history;
167 /* Whether input_file_stack has been restored to a previous state (in
168 which case there should be no more pushing). */
169 static bool input_file_stack_restored;
171 /* Name to use as base of names for dump output files. */
173 const char *dump_base_name;
175 /* Name to use as a base for auxiliary output files. */
177 const char *aux_base_name;
179 /* Bit flags that specify the machine subtype we are compiling for.
180 Bits are tested using macros TARGET_... defined in the tm.h file
181 and set by `-m...' switches. Must be defined in rtlanal.c. */
183 extern int target_flags;
185 /* A mask of target_flags that includes bit X if X was set or cleared
186 on the command line. */
188 int target_flags_explicit;
190 /* Debug hooks - dependent upon command line options. */
192 const struct gcc_debug_hooks *debug_hooks;
194 /* Debug hooks - target default. */
196 static const struct gcc_debug_hooks *default_debug_hooks;
198 /* Other flags saying which kinds of debugging dump have been requested. */
200 int rtl_dump_and_exit;
201 int flag_print_asm_name;
202 enum graph_dump_types graph_dump_format;
204 /* Name for output file of assembly code, specified with -o. */
206 const char *asm_file_name;
208 /* Nonzero means do optimizations. -O.
209 Particular numeric values stand for particular amounts of optimization;
210 thus, -O2 stores 2 here. However, the optimizations beyond the basic
211 ones are not controlled directly by this variable. Instead, they are
212 controlled by individual `flag_...' variables that are defaulted
213 based on this variable. */
215 int optimize = 0;
217 /* Nonzero means optimize for size. -Os.
218 The only valid values are zero and nonzero. When optimize_size is
219 nonzero, optimize defaults to 2, but certain individual code
220 bloating optimizations are disabled. */
222 int optimize_size = 0;
224 /* The FUNCTION_DECL for the function currently being compiled,
225 or 0 if between functions. */
226 tree current_function_decl;
228 /* Set to the FUNC_BEGIN label of the current function, or NULL
229 if none. */
230 const char * current_function_func_begin_label;
232 /* Temporarily suppress certain warnings.
233 This is set while reading code from a system header file. */
235 int in_system_header = 0;
237 /* Nonzero means to collect statistics which might be expensive
238 and to print them when we are done. */
239 int flag_detailed_statistics = 0;
241 /* A random sequence of characters, unless overridden by user. */
242 const char *flag_random_seed;
244 /* A local time stamp derived from the time of compilation. It will be
245 zero if the system cannot provide a time. It will be -1u, if the
246 user has specified a particular random seed. */
247 unsigned local_tick;
249 /* -f flags. */
251 /* Nonzero means `char' should be signed. */
253 int flag_signed_char;
255 /* Nonzero means give an enum type only as many bytes as it needs. A value
256 of 2 means it has not yet been initialized. */
258 int flag_short_enums;
260 /* Nonzero if structures and unions should be returned in memory.
262 This should only be defined if compatibility with another compiler or
263 with an ABI is needed, because it results in slower code. */
265 #ifndef DEFAULT_PCC_STRUCT_RETURN
266 #define DEFAULT_PCC_STRUCT_RETURN 1
267 #endif
269 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
271 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
273 /* 0 means straightforward implementation of complex divide acceptable.
274 1 means wide ranges of inputs must work for complex divide.
275 2 means C99-like requirements for complex multiply and divide. */
277 int flag_complex_method = 1;
279 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
280 not just because the tree inliner turned us off. */
282 int flag_really_no_inline = 2;
284 /* Nonzero means we should be saving declaration info into a .X file. */
286 int flag_gen_aux_info = 0;
288 /* Specified name of aux-info file. */
290 const char *aux_info_file_name;
292 /* Nonzero if we are compiling code for a shared library, zero for
293 executable. */
295 int flag_shlib;
297 /* Generate code for GNU or NeXT Objective-C runtime environment. */
299 #ifdef NEXT_OBJC_RUNTIME
300 int flag_next_runtime = 1;
301 #else
302 int flag_next_runtime = 0;
303 #endif
305 /* Set to the default thread-local storage (tls) model to use. */
307 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
309 /* Nonzero means change certain warnings into errors.
310 Usually these are warnings about failure to conform to some standard. */
312 int flag_pedantic_errors = 0;
314 /* -dA causes debug commentary information to be produced in
315 the generated assembly code (to make it more readable). This option
316 is generally only of use to those who actually need to read the
317 generated assembly code (perhaps while debugging the compiler itself).
318 Currently, this switch is only used by dwarfout.c; however, it is intended
319 to be a catchall for printing debug information in the assembler file. */
321 int flag_debug_asm = 0;
323 /* -dP causes the rtl to be emitted as a comment in assembly. */
325 int flag_dump_rtl_in_asm = 0;
327 /* When non-NULL, indicates that whenever space is allocated on the
328 stack, the resulting stack pointer must not pass this
329 address---that is, for stacks that grow downward, the stack pointer
330 must always be greater than or equal to this address; for stacks
331 that grow upward, the stack pointer must be less than this address.
332 At present, the rtx may be either a REG or a SYMBOL_REF, although
333 the support provided depends on the backend. */
334 rtx stack_limit_rtx;
336 /* If one, renumber instruction UIDs to reduce the number of
337 unused UIDs if there are a lot of instructions. If greater than
338 one, unconditionally renumber instruction UIDs. */
339 int flag_renumber_insns = 1;
341 /* Nonzero if we should track variables. When
342 flag_var_tracking == AUTODETECT_VALUE it will be set according
343 to optimize, debug_info_level and debug_hooks in process_options (). */
344 int flag_var_tracking = AUTODETECT_VALUE;
346 /* True if the user has tagged the function with the 'section'
347 attribute. */
349 bool user_defined_section_attribute = false;
351 /* Values of the -falign-* flags: how much to align labels in code.
352 0 means `use default', 1 means `don't align'.
353 For each variable, there is an _log variant which is the power
354 of two not less than the variable, for .align output. */
356 int align_loops_log;
357 int align_loops_max_skip;
358 int align_jumps_log;
359 int align_jumps_max_skip;
360 int align_labels_log;
361 int align_labels_max_skip;
362 int align_functions_log;
364 /* Like align_functions_log above, but used by front-ends to force the
365 minimum function alignment. Zero means no alignment is forced. */
366 int force_align_functions_log;
368 typedef struct
370 const char *const string;
371 int *const variable;
372 const int on_value;
374 lang_independent_options;
376 /* Nonzero if subexpressions must be evaluated from left-to-right. */
377 int flag_evaluation_order = 0;
379 /* The user symbol prefix after having resolved same. */
380 const char *user_label_prefix;
382 static const param_info lang_independent_params[] = {
383 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
384 { OPTION, DEFAULT, false, MIN, MAX, HELP },
385 #include "params.def"
386 #undef DEFPARAM
387 { NULL, 0, false, 0, 0, NULL }
390 /* Output files for assembler code (real compiler output)
391 and debugging dumps. */
393 FILE *asm_out_file;
394 FILE *aux_info_file;
395 FILE *dump_file = NULL;
396 const char *dump_file_name;
398 /* The current working directory of a translation. It's generally the
399 directory from which compilation was initiated, but a preprocessed
400 file may specify the original directory in which it was
401 created. */
403 static const char *src_pwd;
405 /* Initialize src_pwd with the given string, and return true. If it
406 was already initialized, return false. As a special case, it may
407 be called with a NULL argument to test whether src_pwd has NOT been
408 initialized yet. */
410 bool
411 set_src_pwd (const char *pwd)
413 if (src_pwd)
415 if (strcmp (src_pwd, pwd) == 0)
416 return true;
417 else
418 return false;
421 src_pwd = xstrdup (pwd);
422 return true;
425 /* Return the directory from which the translation unit was initiated,
426 in case set_src_pwd() was not called before to assign it a
427 different value. */
429 const char *
430 get_src_pwd (void)
432 if (! src_pwd)
434 src_pwd = getpwd ();
435 if (!src_pwd)
436 src_pwd = ".";
439 return src_pwd;
442 /* Called when the start of a function definition is parsed,
443 this function prints on stderr the name of the function. */
444 void
445 announce_function (tree decl)
447 if (!quiet_flag)
449 if (rtl_dump_and_exit)
450 fprintf (stderr, "%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
451 else
452 fprintf (stderr, " %s", lang_hooks.decl_printable_name (decl, 2));
453 fflush (stderr);
454 pp_needs_newline (global_dc->printer) = true;
455 diagnostic_set_last_function (global_dc);
459 /* Set up a default flag_random_seed and local_tick, unless the user
460 already specified one. */
462 static void
463 randomize (void)
465 if (!flag_random_seed)
467 unsigned HOST_WIDE_INT value;
468 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
470 /* Get some more or less random data. */
471 #ifdef HAVE_GETTIMEOFDAY
473 struct timeval tv;
475 gettimeofday (&tv, NULL);
476 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
478 #else
480 time_t now = time (NULL);
482 if (now != (time_t)-1)
483 local_tick = (unsigned) now;
485 #endif
486 value = local_tick ^ getpid ();
488 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
489 flag_random_seed = random_seed;
491 else if (!local_tick)
492 local_tick = -1;
496 /* Decode the string P as an integral parameter.
497 If the string is indeed an integer return its numeric value else
498 issue an Invalid Option error for the option PNAME and return DEFVAL.
499 If PNAME is zero just return DEFVAL, do not call error. */
502 read_integral_parameter (const char *p, const char *pname, const int defval)
504 const char *endp = p;
506 while (*endp)
508 if (ISDIGIT (*endp))
509 endp++;
510 else
511 break;
514 if (*endp != 0)
516 if (pname != 0)
517 error ("invalid option argument %qs", pname);
518 return defval;
521 return atoi (p);
524 /* When compiling with a recent enough GCC, we use the GNU C "extern inline"
525 for floor_log2 and exact_log2; see toplev.h. That construct, however,
526 conflicts with the ISO C++ One Definition Rule. */
528 #if GCC_VERSION < 3004 || !defined (__cplusplus)
530 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
531 If X is 0, return -1. */
534 floor_log2 (unsigned HOST_WIDE_INT x)
536 int t = 0;
538 if (x == 0)
539 return -1;
541 #ifdef CLZ_HWI
542 t = HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x);
543 #else
544 if (HOST_BITS_PER_WIDE_INT > 64)
545 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
546 t += 64;
547 if (HOST_BITS_PER_WIDE_INT > 32)
548 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
549 t += 32;
550 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
551 t += 16;
552 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
553 t += 8;
554 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
555 t += 4;
556 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
557 t += 2;
558 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
559 t += 1;
560 #endif
562 return t;
565 /* Return the logarithm of X, base 2, considering X unsigned,
566 if X is a power of 2. Otherwise, returns -1. */
569 exact_log2 (unsigned HOST_WIDE_INT x)
571 if (x != (x & -x))
572 return -1;
573 #ifdef CTZ_HWI
574 return x ? CTZ_HWI (x) : -1;
575 #else
576 return floor_log2 (x);
577 #endif
580 #endif /* GCC_VERSION < 3004 || !defined (__cplusplus) */
582 /* Handler for fatal signals, such as SIGSEGV. These are transformed
583 into ICE messages, which is much more user friendly. In case the
584 error printer crashes, reset the signal to prevent infinite recursion. */
586 static void
587 crash_signal (int signo)
589 signal (signo, SIG_DFL);
591 /* If we crashed while processing an ASM statement, then be a little more
592 graceful. It's most likely the user's fault. */
593 if (this_is_asm_operands)
595 output_operand_lossage ("unrecoverable error");
596 exit (FATAL_EXIT_CODE);
599 internal_error ("%s", strsignal (signo));
602 /* Arrange to dump core on error. (The regular error message is still
603 printed first, except in the case of abort().) */
605 static void
606 setup_core_dumping (void)
608 #ifdef SIGABRT
609 signal (SIGABRT, SIG_DFL);
610 #endif
611 #if defined(HAVE_SETRLIMIT)
613 struct rlimit rlim;
614 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
615 fatal_error ("getting core file size maximum limit: %m");
616 rlim.rlim_cur = rlim.rlim_max;
617 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
618 fatal_error ("setting core file size limit to maximum: %m");
620 #endif
621 diagnostic_abort_on_error (global_dc);
625 /* Strip off a legitimate source ending from the input string NAME of
626 length LEN. Rather than having to know the names used by all of
627 our front ends, we strip off an ending of a period followed by
628 up to five characters. (Java uses ".class".) */
630 void
631 strip_off_ending (char *name, int len)
633 int i;
634 for (i = 2; i < 6 && len > i; i++)
636 if (name[len - i] == '.')
638 name[len - i] = '\0';
639 break;
644 /* Output a quoted string. */
646 void
647 output_quoted_string (FILE *asm_file, const char *string)
649 #ifdef OUTPUT_QUOTED_STRING
650 OUTPUT_QUOTED_STRING (asm_file, string);
651 #else
652 char c;
654 putc ('\"', asm_file);
655 while ((c = *string++) != 0)
657 if (ISPRINT (c))
659 if (c == '\"' || c == '\\')
660 putc ('\\', asm_file);
661 putc (c, asm_file);
663 else
664 fprintf (asm_file, "\\%03o", (unsigned char) c);
666 putc ('\"', asm_file);
667 #endif
670 /* Output a file name in the form wanted by System V. */
672 void
673 output_file_directive (FILE *asm_file, const char *input_name)
675 int len;
676 const char *na;
678 if (input_name == NULL)
679 input_name = "<stdin>";
681 len = strlen (input_name);
682 na = input_name + len;
684 /* NA gets INPUT_NAME sans directory names. */
685 while (na > input_name)
687 if (IS_DIR_SEPARATOR (na[-1]))
688 break;
689 na--;
692 #ifdef ASM_OUTPUT_SOURCE_FILENAME
693 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
694 #else
695 fprintf (asm_file, "\t.file\t");
696 output_quoted_string (asm_file, na);
697 fputc ('\n', asm_file);
698 #endif
701 /* A subroutine of wrapup_global_declarations. We've come to the end of
702 the compilation unit. All deferred variables should be undeferred,
703 and all incomplete decls should be finalized. */
705 void
706 wrapup_global_declaration_1 (tree decl)
708 /* We're not deferring this any longer. Assignment is conditional to
709 avoid needlessly dirtying PCH pages. */
710 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
711 && DECL_DEFER_OUTPUT (decl) != 0)
712 DECL_DEFER_OUTPUT (decl) = 0;
714 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
715 lang_hooks.finish_incomplete_decl (decl);
718 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
719 needs to be output. Return true if it is output. */
721 bool
722 wrapup_global_declaration_2 (tree decl)
724 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
725 return false;
727 /* Don't write out static consts, unless we still need them.
729 We also keep static consts if not optimizing (for debugging),
730 unless the user specified -fno-keep-static-consts.
731 ??? They might be better written into the debug information.
732 This is possible when using DWARF.
734 A language processor that wants static constants to be always
735 written out (even if it is not used) is responsible for
736 calling rest_of_decl_compilation itself. E.g. the C front-end
737 calls rest_of_decl_compilation from finish_decl.
738 One motivation for this is that is conventional in some
739 environments to write things like:
740 static const char rcsid[] = "... version string ...";
741 intending to force the string to be in the executable.
743 A language processor that would prefer to have unneeded
744 static constants "optimized away" would just defer writing
745 them out until here. E.g. C++ does this, because static
746 constants are often defined in header files.
748 ??? A tempting alternative (for both C and C++) would be
749 to force a constant to be written if and only if it is
750 defined in a main file, as opposed to an include file. */
752 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
754 struct varpool_node *node;
755 bool needed = true;
756 node = varpool_node (decl);
758 if (node->finalized)
759 needed = false;
760 else if (node->alias)
761 needed = false;
762 else if (!cgraph_global_info_ready
763 && (TREE_USED (decl)
764 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
765 /* needed */;
766 else if (node->needed)
767 /* needed */;
768 else if (DECL_COMDAT (decl))
769 needed = false;
770 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
771 && (optimize || !flag_keep_static_consts
772 || DECL_ARTIFICIAL (decl)))
773 needed = false;
775 if (needed)
777 rest_of_decl_compilation (decl, 1, 1);
778 return true;
782 return false;
785 /* Do any final processing required for the declarations in VEC, of
786 which there are LEN. We write out inline functions and variables
787 that have been deferred until this point, but which are required.
788 Returns nonzero if anything was put out. */
790 bool
791 wrapup_global_declarations (tree *vec, int len)
793 bool reconsider, output_something = false;
794 int i;
796 for (i = 0; i < len; i++)
797 wrapup_global_declaration_1 (vec[i]);
799 /* Now emit any global variables or functions that we have been
800 putting off. We need to loop in case one of the things emitted
801 here references another one which comes earlier in the list. */
804 reconsider = false;
805 for (i = 0; i < len; i++)
806 reconsider |= wrapup_global_declaration_2 (vec[i]);
807 if (reconsider)
808 output_something = true;
810 while (reconsider);
812 return output_something;
815 /* A subroutine of check_global_declarations. Issue appropriate warnings
816 for the global declaration DECL. */
818 void
819 check_global_declaration_1 (tree decl)
821 /* Warn about any function declared static but not defined. We don't
822 warn about variables, because many programs have static variables
823 that exist only to get some text into the object file. */
824 if (TREE_CODE (decl) == FUNCTION_DECL
825 && DECL_INITIAL (decl) == 0
826 && DECL_EXTERNAL (decl)
827 && ! DECL_ARTIFICIAL (decl)
828 && ! TREE_NO_WARNING (decl)
829 && ! TREE_PUBLIC (decl)
830 && (warn_unused_function
831 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
833 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
834 pedwarn ("%q+F used but never defined", decl);
835 else
836 warning (0, "%q+F declared %<static%> but never defined", decl);
837 /* This symbol is effectively an "extern" declaration now. */
838 TREE_PUBLIC (decl) = 1;
839 assemble_external (decl);
842 /* Warn about static fns or vars defined but not used. */
843 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
844 /* We don't warn about "static const" variables because the
845 "rcs_id" idiom uses that construction. */
846 || (warn_unused_variable
847 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
848 && ! DECL_IN_SYSTEM_HEADER (decl)
849 && ! TREE_USED (decl)
850 /* The TREE_USED bit for file-scope decls is kept in the identifier,
851 to handle multiple external decls in different scopes. */
852 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
853 && ! DECL_EXTERNAL (decl)
854 && ! TREE_PUBLIC (decl)
855 /* A volatile variable might be used in some non-obvious way. */
856 && ! TREE_THIS_VOLATILE (decl)
857 /* Global register variables must be declared to reserve them. */
858 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
859 /* Otherwise, ask the language. */
860 && lang_hooks.decls.warn_unused_global (decl))
861 warning (0, "%q+D defined but not used", decl);
864 /* Issue appropriate warnings for the global declarations in VEC (of
865 which there are LEN). */
867 void
868 check_global_declarations (tree *vec, int len)
870 int i;
872 for (i = 0; i < len; i++)
873 check_global_declaration_1 (vec[i]);
876 /* Emit debugging information for all global declarations in VEC. */
878 void
879 emit_debug_global_declarations (tree *vec, int len)
881 int i;
883 /* Avoid confusing the debug information machinery when there are errors. */
884 if (errorcount != 0 || sorrycount != 0)
885 return;
887 timevar_push (TV_SYMOUT);
888 for (i = 0; i < len; i++)
889 debug_hooks->global_decl (vec[i]);
890 timevar_pop (TV_SYMOUT);
893 /* Warn about a use of an identifier which was marked deprecated. */
894 void
895 warn_deprecated_use (tree node)
897 if (node == 0 || !warn_deprecated_decl)
898 return;
900 if (DECL_P (node))
902 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
903 warning (OPT_Wdeprecated_declarations,
904 "%qD is deprecated (declared at %s:%d)",
905 node, xloc.file, xloc.line);
907 else if (TYPE_P (node))
909 const char *what = NULL;
910 tree decl = TYPE_STUB_DECL (node);
912 if (TYPE_NAME (node))
914 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
915 what = IDENTIFIER_POINTER (TYPE_NAME (node));
916 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
917 && DECL_NAME (TYPE_NAME (node)))
918 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
921 if (decl)
923 expanded_location xloc
924 = expand_location (DECL_SOURCE_LOCATION (decl));
925 if (what)
926 warning (OPT_Wdeprecated_declarations,
927 "%qs is deprecated (declared at %s:%d)", what,
928 xloc.file, xloc.line);
929 else
930 warning (OPT_Wdeprecated_declarations,
931 "type is deprecated (declared at %s:%d)",
932 xloc.file, xloc.line);
934 else
936 if (what)
937 warning (OPT_Wdeprecated_declarations, "%qs is deprecated", what);
938 else
939 warning (OPT_Wdeprecated_declarations, "type is deprecated");
944 /* Save the current INPUT_LOCATION on the top entry in the
945 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
946 INPUT_LOCATION accordingly. */
948 void
949 #ifdef USE_MAPPED_LOCATION
950 push_srcloc (location_t fline)
951 #else
952 push_srcloc (const char *file, int line)
953 #endif
955 struct file_stack *fs;
957 gcc_assert (!input_file_stack_restored);
958 if (input_file_stack_tick == (int) ((1U << INPUT_FILE_STACK_BITS) - 1))
959 sorry ("GCC supports only %d input file changes", input_file_stack_tick);
961 fs = XNEW (struct file_stack);
962 fs->location = input_location;
963 fs->next = input_file_stack;
964 #ifdef USE_MAPPED_LOCATION
965 input_location = fline;
966 #else
967 input_filename = file;
968 input_line = line;
969 #endif
970 input_file_stack = fs;
971 input_file_stack_tick++;
972 VEC_safe_push (fs_p, heap, input_file_stack_history, input_file_stack);
975 /* Pop the top entry off the stack of presently open source files.
976 Restore the INPUT_LOCATION from the new topmost entry on the
977 stack. */
979 void
980 pop_srcloc (void)
982 struct file_stack *fs;
984 gcc_assert (!input_file_stack_restored);
985 if (input_file_stack_tick == (int) ((1U << INPUT_FILE_STACK_BITS) - 1))
986 sorry ("GCC supports only %d input file changes", input_file_stack_tick);
988 fs = input_file_stack;
989 input_location = fs->location;
990 input_file_stack = fs->next;
991 input_file_stack_tick++;
992 VEC_safe_push (fs_p, heap, input_file_stack_history, input_file_stack);
995 /* Restore the input file stack to its state as of TICK, for the sake
996 of diagnostics after processing the whole input. Once this has
997 been called, push_srcloc and pop_srcloc may no longer be
998 called. */
999 void
1000 restore_input_file_stack (int tick)
1002 if (tick == 0)
1003 input_file_stack = NULL;
1004 else
1005 input_file_stack = VEC_index (fs_p, input_file_stack_history, tick - 1);
1006 input_file_stack_tick = tick;
1007 input_file_stack_restored = true;
1010 /* Compile an entire translation unit. Write a file of assembly
1011 output and various debugging dumps. */
1013 static void
1014 compile_file (void)
1016 /* Initialize yet another pass. */
1018 init_cgraph ();
1019 init_final (main_input_filename);
1020 coverage_init (aux_base_name);
1022 timevar_push (TV_PARSE);
1024 /* Call the parser, which parses the entire file (calling
1025 rest_of_compilation for each function). */
1026 lang_hooks.parse_file (set_yydebug);
1028 /* In case there were missing block closers,
1029 get us back to the global binding level. */
1030 lang_hooks.clear_binding_stack ();
1032 /* Compilation is now finished except for writing
1033 what's left of the symbol table output. */
1034 timevar_pop (TV_PARSE);
1036 if (flag_syntax_only)
1037 return;
1039 lang_hooks.decls.final_write_globals ();
1041 if (errorcount || sorrycount)
1042 return;
1044 varpool_assemble_pending_decls ();
1045 finish_aliases_2 ();
1047 /* This must occur after the loop to output deferred functions.
1048 Else the coverage initializer would not be emitted if all the
1049 functions in this compilation unit were deferred. */
1050 coverage_finish ();
1052 /* Likewise for mudflap static object registrations. */
1053 if (flag_mudflap)
1054 mudflap_finish_file ();
1056 output_shared_constant_pool ();
1057 output_object_blocks ();
1059 /* Write out any pending weak symbol declarations. */
1061 weak_finish ();
1063 /* Do dbx symbols. */
1064 timevar_push (TV_SYMOUT);
1066 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1067 if (dwarf2out_do_frame ())
1068 dwarf2out_frame_finish ();
1069 #endif
1071 (*debug_hooks->finish) (main_input_filename);
1072 timevar_pop (TV_SYMOUT);
1074 /* Output some stuff at end of file if nec. */
1076 dw2_output_indirect_constants ();
1078 /* Flush any pending external directives. */
1079 process_pending_assemble_externals ();
1081 /* Attach a special .ident directive to the end of the file to identify
1082 the version of GCC which compiled this code. The format of the .ident
1083 string is patterned after the ones produced by native SVR4 compilers. */
1084 #ifdef IDENT_ASM_OP
1085 if (!flag_no_ident)
1086 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1087 IDENT_ASM_OP, version_string);
1088 #endif
1090 /* This must be at the end. Some target ports emit end of file directives
1091 into the assembly file here, and hence we can not output anything to the
1092 assembly file after this point. */
1093 targetm.asm_out.file_end ();
1096 /* Parse a -d... command line switch. */
1098 void
1099 decode_d_option (const char *arg)
1101 int c;
1103 while (*arg)
1104 switch (c = *arg++)
1106 case 'A':
1107 flag_debug_asm = 1;
1108 break;
1109 case 'p':
1110 flag_print_asm_name = 1;
1111 break;
1112 case 'P':
1113 flag_dump_rtl_in_asm = 1;
1114 flag_print_asm_name = 1;
1115 break;
1116 case 'v':
1117 graph_dump_format = vcg;
1118 break;
1119 case 'x':
1120 rtl_dump_and_exit = 1;
1121 break;
1122 case 'y':
1123 set_yydebug = 1;
1124 break;
1125 case 'D': /* These are handled by the preprocessor. */
1126 case 'I':
1127 break;
1128 case 'H':
1129 setup_core_dumping();
1130 break;
1132 case 'a':
1133 default:
1134 if (!enable_rtl_dump_file (c))
1135 warning (0, "unrecognized gcc debugging option: %c", c);
1136 break;
1140 /* Indexed by enum debug_info_type. */
1141 const char *const debug_type_names[] =
1143 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1146 /* Print version information to FILE.
1147 Each line begins with INDENT (for the case where FILE is the
1148 assembler output file). */
1150 void
1151 print_version (FILE *file, const char *indent)
1153 static const char fmt1[] =
1154 #ifdef __GNUC__
1155 N_("%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n")
1156 #else
1157 N_("%s%s%s version %s (%s) compiled by CC.\n")
1158 #endif
1160 static const char fmt2[] =
1161 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1162 #ifndef __VERSION__
1163 #define __VERSION__ "[?]"
1164 #endif
1165 fprintf (file,
1166 file == stderr ? _(fmt1) : fmt1,
1167 indent, *indent != 0 ? " " : "",
1168 lang_hooks.name, version_string, TARGET_NAME,
1169 indent, __VERSION__);
1170 fprintf (file,
1171 file == stderr ? _(fmt2) : fmt2,
1172 indent, *indent != 0 ? " " : "",
1173 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1176 #ifdef ASM_COMMENT_START
1177 static int
1178 print_to_asm_out_file (print_switch_type type, const char * text)
1180 bool prepend_sep = true;
1182 switch (type)
1184 case SWITCH_TYPE_LINE_END:
1185 putc ('\n', asm_out_file);
1186 return 1;
1188 case SWITCH_TYPE_LINE_START:
1189 fputs (ASM_COMMENT_START, asm_out_file);
1190 return strlen (ASM_COMMENT_START);
1192 case SWITCH_TYPE_DESCRIPTIVE:
1193 if (ASM_COMMENT_START[0] == 0)
1194 prepend_sep = false;
1195 /* Drop through. */
1196 case SWITCH_TYPE_PASSED:
1197 case SWITCH_TYPE_ENABLED:
1198 if (prepend_sep)
1199 fputc (' ', asm_out_file);
1200 fprintf (asm_out_file, text);
1201 /* No need to return the length here as
1202 print_single_switch has already done it. */
1203 return 0;
1205 default:
1206 return -1;
1209 #endif
1211 static int
1212 print_to_stderr (print_switch_type type, const char * text)
1214 switch (type)
1216 case SWITCH_TYPE_LINE_END:
1217 putc ('\n', stderr);
1218 return 1;
1220 case SWITCH_TYPE_LINE_START:
1221 return 0;
1223 case SWITCH_TYPE_PASSED:
1224 case SWITCH_TYPE_ENABLED:
1225 fputc (' ', stderr);
1226 /* Drop through. */
1228 case SWITCH_TYPE_DESCRIPTIVE:
1229 fprintf (stderr, text);
1230 /* No need to return the length here as
1231 print_single_switch has already done it. */
1232 return 0;
1234 default:
1235 return -1;
1239 /* Print an option value and return the adjusted position in the line.
1240 ??? print_fn doesn't handle errors, eg disk full; presumably other
1241 code will catch a disk full though. */
1243 static int
1244 print_single_switch (print_switch_fn_type print_fn,
1245 int pos,
1246 print_switch_type type,
1247 const char * text)
1249 /* The ultrix fprintf returns 0 on success, so compute the result
1250 we want here since we need it for the following test. The +1
1251 is for the separator character that will probably be emitted. */
1252 int len = strlen (text) + 1;
1254 if (pos != 0
1255 && pos + len > MAX_LINE)
1257 print_fn (SWITCH_TYPE_LINE_END, NULL);
1258 pos = 0;
1261 if (pos == 0)
1262 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1264 print_fn (type, text);
1265 return pos + len;
1268 /* Print active target switches using PRINT_FN.
1269 POS is the current cursor position and MAX is the size of a "line".
1270 Each line begins with INDENT and ends with TERM.
1271 Each switch is separated from the next by SEP. */
1273 static void
1274 print_switch_values (print_switch_fn_type print_fn)
1276 int pos = 0;
1277 size_t j;
1278 const char **p;
1280 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1281 that it can be printed below. This helps reproducibility. */
1282 randomize ();
1284 /* Print the options as passed. */
1285 pos = print_single_switch (print_fn, pos,
1286 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1288 for (p = &save_argv[1]; *p != NULL; p++)
1290 if (**p == '-')
1292 /* Ignore these. */
1293 if (strcmp (*p, "-o") == 0
1294 || strcmp (*p, "-dumpbase") == 0
1295 || strcmp (*p, "-auxbase") == 0)
1297 if (p[1] != NULL)
1298 p++;
1299 continue;
1302 if (strcmp (*p, "-quiet") == 0
1303 || strcmp (*p, "-version") == 0)
1304 continue;
1306 if ((*p)[1] == 'd')
1307 continue;
1310 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED, *p);
1313 if (pos > 0)
1314 print_fn (SWITCH_TYPE_LINE_END, NULL);
1316 /* Print the -f and -m options that have been enabled.
1317 We don't handle language specific options but printing argv
1318 should suffice. */
1319 pos = print_single_switch (print_fn, 0,
1320 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1322 for (j = 0; j < cl_options_count; j++)
1323 if ((cl_options[j].flags & CL_REPORT)
1324 && option_enabled (j) > 0)
1325 pos = print_single_switch (print_fn, pos,
1326 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1328 print_fn (SWITCH_TYPE_LINE_END, NULL);
1331 /* Open assembly code output file. Do this even if -fsyntax-only is
1332 on, because then the driver will have provided the name of a
1333 temporary file or bit bucket for us. NAME is the file specified on
1334 the command line, possibly NULL. */
1335 static void
1336 init_asm_output (const char *name)
1338 if (name == NULL && asm_file_name == 0)
1339 asm_out_file = stdout;
1340 else
1342 if (asm_file_name == 0)
1344 int len = strlen (dump_base_name);
1345 char *dumpname = XNEWVEC (char, len + 6);
1347 memcpy (dumpname, dump_base_name, len + 1);
1348 strip_off_ending (dumpname, len);
1349 strcat (dumpname, ".s");
1350 asm_file_name = dumpname;
1352 if (!strcmp (asm_file_name, "-"))
1353 asm_out_file = stdout;
1354 else
1355 asm_out_file = fopen (asm_file_name, "w+b");
1356 if (asm_out_file == 0)
1357 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1360 if (!flag_syntax_only)
1362 targetm.asm_out.file_start ();
1364 if (flag_record_gcc_switches)
1366 if (targetm.asm_out.record_gcc_switches)
1368 /* Let the target know that we are about to start recording. */
1369 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1370 NULL);
1371 /* Now record the switches. */
1372 print_switch_values (targetm.asm_out.record_gcc_switches);
1373 /* Let the target know that the recording is over. */
1374 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1375 NULL);
1377 else
1378 inform ("-frecord-gcc-switches is not supported by the current target");
1381 #ifdef ASM_COMMENT_START
1382 if (flag_verbose_asm)
1384 /* Print the list of switches in effect
1385 into the assembler file as comments. */
1386 print_version (asm_out_file, ASM_COMMENT_START);
1387 print_switch_values (print_to_asm_out_file);
1388 fprintf (asm_out_file, "\n");
1390 #endif
1394 /* Return true if the state of option OPTION should be stored in PCH files
1395 and checked by default_pch_valid_p. Store the option's current state
1396 in STATE if so. */
1398 static inline bool
1399 option_affects_pch_p (int option, struct cl_option_state *state)
1401 if ((cl_options[option].flags & CL_TARGET) == 0)
1402 return false;
1403 if (cl_options[option].flag_var == &target_flags)
1404 if (targetm.check_pch_target_flags)
1405 return false;
1406 return get_option_state (option, state);
1409 /* Default version of get_pch_validity.
1410 By default, every flag difference is fatal; that will be mostly right for
1411 most targets, but completely right for very few. */
1413 void *
1414 default_get_pch_validity (size_t *len)
1416 struct cl_option_state state;
1417 size_t i;
1418 char *result, *r;
1420 *len = 2;
1421 if (targetm.check_pch_target_flags)
1422 *len += sizeof (target_flags);
1423 for (i = 0; i < cl_options_count; i++)
1424 if (option_affects_pch_p (i, &state))
1425 *len += state.size;
1427 result = r = XNEWVEC (char, *len);
1428 r[0] = flag_pic;
1429 r[1] = flag_pie;
1430 r += 2;
1431 if (targetm.check_pch_target_flags)
1433 memcpy (r, &target_flags, sizeof (target_flags));
1434 r += sizeof (target_flags);
1437 for (i = 0; i < cl_options_count; i++)
1438 if (option_affects_pch_p (i, &state))
1440 memcpy (r, state.data, state.size);
1441 r += state.size;
1444 return result;
1447 /* Return a message which says that a PCH file was created with a different
1448 setting of OPTION. */
1450 static const char *
1451 pch_option_mismatch (const char *option)
1453 char *r;
1455 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1456 if (r == NULL)
1457 return _("out of memory");
1458 return r;
1461 /* Default version of pch_valid_p. */
1463 const char *
1464 default_pch_valid_p (const void *data_p, size_t len)
1466 struct cl_option_state state;
1467 const char *data = (const char *)data_p;
1468 size_t i;
1470 /* -fpic and -fpie also usually make a PCH invalid. */
1471 if (data[0] != flag_pic)
1472 return _("created and used with different settings of -fpic");
1473 if (data[1] != flag_pie)
1474 return _("created and used with different settings of -fpie");
1475 data += 2;
1477 /* Check target_flags. */
1478 if (targetm.check_pch_target_flags)
1480 int tf;
1481 const char *r;
1483 memcpy (&tf, data, sizeof (target_flags));
1484 data += sizeof (target_flags);
1485 len -= sizeof (target_flags);
1486 r = targetm.check_pch_target_flags (tf);
1487 if (r != NULL)
1488 return r;
1491 for (i = 0; i < cl_options_count; i++)
1492 if (option_affects_pch_p (i, &state))
1494 if (memcmp (data, state.data, state.size) != 0)
1495 return pch_option_mismatch (cl_options[i].opt_text);
1496 data += state.size;
1497 len -= state.size;
1500 return NULL;
1503 /* Default tree printer. Handles declarations only. */
1504 static bool
1505 default_tree_printer (pretty_printer * pp, text_info *text, const char *spec,
1506 int precision, bool wide, bool set_locus, bool hash)
1508 tree t;
1510 /* FUTURE: %+x should set the locus. */
1511 if (precision != 0 || wide || hash)
1512 return false;
1514 switch (*spec)
1516 case 'D':
1517 t = va_arg (*text->args_ptr, tree);
1518 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1519 t = DECL_DEBUG_EXPR (t);
1520 break;
1522 case 'F':
1523 case 'T':
1524 t = va_arg (*text->args_ptr, tree);
1525 break;
1527 default:
1528 return false;
1531 if (set_locus && text->locus)
1532 *text->locus = DECL_SOURCE_LOCATION (t);
1534 if (DECL_P (t))
1536 const char *n = DECL_NAME (t)
1537 ? lang_hooks.decl_printable_name (t, 2)
1538 : "<anonymous>";
1539 pp_string (pp, n);
1541 else
1542 dump_generic_node (pp, t, 0, 0, 0);
1544 return true;
1547 /* Initialization of the front end environment, before command line
1548 options are parsed. Signal handlers, internationalization etc.
1549 ARGV0 is main's argv[0]. */
1550 static void
1551 general_init (const char *argv0)
1553 const char *p;
1555 p = argv0 + strlen (argv0);
1556 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1557 --p;
1558 progname = p;
1560 xmalloc_set_program_name (progname);
1562 hex_init ();
1564 /* Unlock the stdio streams. */
1565 unlock_std_streams ();
1567 gcc_init_libintl ();
1569 /* Initialize the diagnostics reporting machinery, so option parsing
1570 can give warnings and errors. */
1571 diagnostic_initialize (global_dc);
1572 /* Set a default printer. Language specific initializations will
1573 override it later. */
1574 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1576 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1577 #ifdef SIGSEGV
1578 signal (SIGSEGV, crash_signal);
1579 #endif
1580 #ifdef SIGILL
1581 signal (SIGILL, crash_signal);
1582 #endif
1583 #ifdef SIGBUS
1584 signal (SIGBUS, crash_signal);
1585 #endif
1586 #ifdef SIGABRT
1587 signal (SIGABRT, crash_signal);
1588 #endif
1589 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1590 signal (SIGIOT, crash_signal);
1591 #endif
1592 #ifdef SIGFPE
1593 signal (SIGFPE, crash_signal);
1594 #endif
1596 /* Other host-specific signal setup. */
1597 (*host_hooks.extra_signals)();
1599 /* Initialize the garbage-collector, string pools and tree type hash
1600 table. */
1601 init_ggc ();
1602 init_stringpool ();
1603 linemap_init (&line_table);
1604 init_ttree ();
1606 /* Initialize register usage now so switches may override. */
1607 init_reg_sets ();
1609 /* Register the language-independent parameters. */
1610 add_params (lang_independent_params, LAST_PARAM);
1612 /* This must be done after add_params but before argument processing. */
1613 init_ggc_heuristics();
1614 init_optimization_passes ();
1617 /* Return true if the current target supports -fsection-anchors. */
1619 static bool
1620 target_supports_section_anchors_p (void)
1622 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1623 return false;
1625 if (targetm.asm_out.output_anchor == NULL)
1626 return false;
1628 return true;
1631 /* Process the options that have been parsed. */
1632 static void
1633 process_options (void)
1635 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1636 This can happen with incorrect pre-processed input. */
1637 debug_hooks = &do_nothing_debug_hooks;
1639 /* Allow the front end to perform consistency checks and do further
1640 initialization based on the command line options. This hook also
1641 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1642 so we can correctly initialize debug output. */
1643 no_backend = lang_hooks.post_options (&main_input_filename);
1644 #ifndef USE_MAPPED_LOCATION
1645 input_filename = main_input_filename;
1646 #endif
1648 #ifdef OVERRIDE_OPTIONS
1649 /* Some machines may reject certain combinations of options. */
1650 OVERRIDE_OPTIONS;
1651 #endif
1653 if (flag_section_anchors && !target_supports_section_anchors_p ())
1655 warning (OPT_fsection_anchors,
1656 "this target does not support %qs", "-fsection-anchors");
1657 flag_section_anchors = 0;
1660 if (flag_short_enums == 2)
1661 flag_short_enums = targetm.default_short_enums ();
1663 /* Set aux_base_name if not already set. */
1664 if (aux_base_name)
1666 else if (main_input_filename)
1668 char *name = xstrdup (lbasename (main_input_filename));
1670 strip_off_ending (name, strlen (name));
1671 aux_base_name = name;
1673 else
1674 aux_base_name = "gccaux";
1676 /* Set up the align_*_log variables, defaulting them to 1 if they
1677 were still unset. */
1678 if (align_loops <= 0) align_loops = 1;
1679 if (align_loops_max_skip > align_loops || !align_loops)
1680 align_loops_max_skip = align_loops - 1;
1681 align_loops_log = floor_log2 (align_loops * 2 - 1);
1682 if (align_jumps <= 0) align_jumps = 1;
1683 if (align_jumps_max_skip > align_jumps || !align_jumps)
1684 align_jumps_max_skip = align_jumps - 1;
1685 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1686 if (align_labels <= 0) align_labels = 1;
1687 align_labels_log = floor_log2 (align_labels * 2 - 1);
1688 if (align_labels_max_skip > align_labels || !align_labels)
1689 align_labels_max_skip = align_labels - 1;
1690 if (align_functions <= 0) align_functions = 1;
1691 align_functions_log = floor_log2 (align_functions * 2 - 1);
1693 /* Unrolling all loops implies that standard loop unrolling must also
1694 be done. */
1695 if (flag_unroll_all_loops)
1696 flag_unroll_loops = 1;
1698 /* The loop unrolling code assumes that cse will be run after loop.
1699 web and rename-registers also help when run after loop unrolling. */
1701 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1702 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1703 if (flag_web == AUTODETECT_VALUE)
1704 flag_web = flag_unroll_loops || flag_peel_loops;
1705 if (flag_rename_registers == AUTODETECT_VALUE)
1706 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1708 if (flag_non_call_exceptions)
1709 flag_asynchronous_unwind_tables = 1;
1710 if (flag_asynchronous_unwind_tables)
1711 flag_unwind_tables = 1;
1713 /* Disable unit-at-a-time mode for frontends not supporting callgraph
1714 interface. */
1715 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
1716 flag_unit_at_a_time = 0;
1718 if (!flag_unit_at_a_time)
1719 flag_section_anchors = 0;
1721 if (flag_value_profile_transformations)
1722 flag_profile_values = 1;
1724 /* Warn about options that are not supported on this machine. */
1725 #ifndef INSN_SCHEDULING
1726 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1727 warning (0, "instruction scheduling not supported on this target machine");
1728 #endif
1729 #ifndef DELAY_SLOTS
1730 if (flag_delayed_branch)
1731 warning (0, "this target machine does not have delayed branches");
1732 #endif
1734 user_label_prefix = USER_LABEL_PREFIX;
1735 if (flag_leading_underscore != -1)
1737 /* If the default prefix is more complicated than "" or "_",
1738 issue a warning and ignore this option. */
1739 if (user_label_prefix[0] == 0 ||
1740 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1742 user_label_prefix = flag_leading_underscore ? "_" : "";
1744 else
1745 warning (0, "-f%sleading-underscore not supported on this target machine",
1746 flag_leading_underscore ? "" : "no-");
1749 /* If we are in verbose mode, write out the version and maybe all the
1750 option flags in use. */
1751 if (version_flag)
1753 print_version (stderr, "");
1754 if (! quiet_flag)
1755 print_switch_values (print_to_stderr);
1758 if (flag_syntax_only)
1760 write_symbols = NO_DEBUG;
1761 profile_flag = 0;
1764 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1765 level is 0. */
1766 if (debug_info_level == DINFO_LEVEL_NONE)
1767 write_symbols = NO_DEBUG;
1769 /* Now we know write_symbols, set up the debug hooks based on it.
1770 By default we do nothing for debug output. */
1771 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1772 default_debug_hooks = &do_nothing_debug_hooks;
1773 #if defined(DBX_DEBUGGING_INFO)
1774 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1775 default_debug_hooks = &dbx_debug_hooks;
1776 #endif
1777 #if defined(XCOFF_DEBUGGING_INFO)
1778 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1779 default_debug_hooks = &xcoff_debug_hooks;
1780 #endif
1781 #ifdef SDB_DEBUGGING_INFO
1782 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1783 default_debug_hooks = &sdb_debug_hooks;
1784 #endif
1785 #ifdef DWARF2_DEBUGGING_INFO
1786 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1787 default_debug_hooks = &dwarf2_debug_hooks;
1788 #endif
1789 #ifdef VMS_DEBUGGING_INFO
1790 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1791 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1792 default_debug_hooks = &vmsdbg_debug_hooks;
1793 #endif
1795 if (write_symbols == NO_DEBUG)
1797 #if defined(DBX_DEBUGGING_INFO)
1798 else if (write_symbols == DBX_DEBUG)
1799 debug_hooks = &dbx_debug_hooks;
1800 #endif
1801 #if defined(XCOFF_DEBUGGING_INFO)
1802 else if (write_symbols == XCOFF_DEBUG)
1803 debug_hooks = &xcoff_debug_hooks;
1804 #endif
1805 #ifdef SDB_DEBUGGING_INFO
1806 else if (write_symbols == SDB_DEBUG)
1807 debug_hooks = &sdb_debug_hooks;
1808 #endif
1809 #ifdef DWARF2_DEBUGGING_INFO
1810 else if (write_symbols == DWARF2_DEBUG)
1811 debug_hooks = &dwarf2_debug_hooks;
1812 #endif
1813 #ifdef VMS_DEBUGGING_INFO
1814 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1815 debug_hooks = &vmsdbg_debug_hooks;
1816 #endif
1817 else
1818 error ("target system does not support the \"%s\" debug format",
1819 debug_type_names[write_symbols]);
1821 /* Now we know which debug output will be used so we can set
1822 flag_var_tracking, flag_rename_registers if the user has
1823 not specified them. */
1824 if (debug_info_level < DINFO_LEVEL_NORMAL
1825 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1827 if (flag_var_tracking == 1)
1829 if (debug_info_level < DINFO_LEVEL_NORMAL)
1830 warning (0, "variable tracking requested, but useless unless "
1831 "producing debug info");
1832 else
1833 warning (0, "variable tracking requested, but not supported "
1834 "by this debug format");
1836 flag_var_tracking = 0;
1839 if (flag_rename_registers == AUTODETECT_VALUE)
1840 flag_rename_registers = default_debug_hooks->var_location
1841 != do_nothing_debug_hooks.var_location;
1843 if (flag_var_tracking == AUTODETECT_VALUE)
1844 flag_var_tracking = optimize >= 1;
1846 /* If auxiliary info generation is desired, open the output file.
1847 This goes in the same directory as the source file--unlike
1848 all the other output files. */
1849 if (flag_gen_aux_info)
1851 aux_info_file = fopen (aux_info_file_name, "w");
1852 if (aux_info_file == 0)
1853 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1856 if (! targetm.have_named_sections)
1858 if (flag_function_sections)
1860 warning (0, "-ffunction-sections not supported for this target");
1861 flag_function_sections = 0;
1863 if (flag_data_sections)
1865 warning (0, "-fdata-sections not supported for this target");
1866 flag_data_sections = 0;
1870 if (flag_function_sections && profile_flag)
1872 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1873 flag_function_sections = 0;
1876 #ifndef HAVE_prefetch
1877 if (flag_prefetch_loop_arrays)
1879 warning (0, "-fprefetch-loop-arrays not supported for this target");
1880 flag_prefetch_loop_arrays = 0;
1882 #else
1883 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1885 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1886 flag_prefetch_loop_arrays = 0;
1888 #endif
1890 /* This combination of options isn't handled for i386 targets and doesn't
1891 make much sense anyway, so don't allow it. */
1892 if (flag_prefetch_loop_arrays && optimize_size)
1894 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1895 flag_prefetch_loop_arrays = 0;
1898 #ifndef OBJECT_FORMAT_ELF
1899 #ifndef OBJECT_FORMAT_MACHO
1900 if (flag_function_sections && write_symbols != NO_DEBUG)
1901 warning (0, "-ffunction-sections may affect debugging on some targets");
1902 #endif
1903 #endif
1905 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1906 if (flag_signaling_nans)
1907 flag_trapping_math = 1;
1909 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1910 if (flag_cx_limited_range)
1911 flag_complex_method = 0;
1913 /* Targets must be able to place spill slots at lower addresses. If the
1914 target already uses a soft frame pointer, the transition is trivial. */
1915 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1917 warning (0, "-fstack-protector not supported for this target");
1918 flag_stack_protect = 0;
1920 if (!flag_stack_protect)
1921 warn_stack_protect = 0;
1923 /* ??? Unwind info is not correct around the CFG unless either a frame
1924 pointer is present or A_O_A is set. Fixing this requires rewriting
1925 unwind info generation to be aware of the CFG and propagating states
1926 around edges. */
1927 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1928 && flag_omit_frame_pointer)
1930 warning (0, "unwind tables currently requires a frame pointer "
1931 "for correctness");
1932 flag_omit_frame_pointer = 0;
1936 /* Initialize the compiler back end. */
1937 static void
1938 backend_init (void)
1940 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
1941 || debug_info_level == DINFO_LEVEL_VERBOSE
1942 #ifdef VMS_DEBUGGING_INFO
1943 /* Enable line number info for traceback. */
1944 || debug_info_level > DINFO_LEVEL_NONE
1945 #endif
1946 || flag_test_coverage);
1948 init_rtlanal ();
1949 init_regs ();
1950 init_fake_stack_mems ();
1951 init_alias_once ();
1952 init_inline_once ();
1953 init_reload ();
1954 init_varasm_once ();
1956 /* The following initialization functions need to generate rtl, so
1957 provide a dummy function context for them. */
1958 init_dummy_function_start ();
1959 init_expmed ();
1960 if (flag_caller_saves)
1961 init_caller_save ();
1962 expand_dummy_function_end ();
1965 /* Language-dependent initialization. Returns nonzero on success. */
1966 static int
1967 lang_dependent_init (const char *name)
1969 location_t save_loc = input_location;
1970 if (dump_base_name == 0)
1971 dump_base_name = name && name[0] ? name : "gccdump";
1973 /* Other front-end initialization. */
1974 #ifdef USE_MAPPED_LOCATION
1975 input_location = BUILTINS_LOCATION;
1976 #else
1977 input_filename = "<built-in>";
1978 input_line = 0;
1979 #endif
1980 if (lang_hooks.init () == 0)
1981 return 0;
1982 input_location = save_loc;
1984 init_asm_output (name);
1986 /* These create various _DECL nodes, so need to be called after the
1987 front end is initialized. */
1988 init_eh ();
1989 init_optabs ();
1991 /* The following initialization functions need to generate rtl, so
1992 provide a dummy function context for them. */
1993 init_dummy_function_start ();
1994 init_expr_once ();
1995 expand_dummy_function_end ();
1997 /* If dbx symbol table desired, initialize writing it and output the
1998 predefined types. */
1999 timevar_push (TV_SYMOUT);
2001 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2002 if (dwarf2out_do_frame ())
2003 dwarf2out_frame_init ();
2004 #endif
2006 /* Now we have the correct original filename, we can initialize
2007 debug output. */
2008 (*debug_hooks->init) (name);
2010 timevar_pop (TV_SYMOUT);
2012 return 1;
2015 void
2016 dump_memory_report (bool final)
2018 ggc_print_statistics ();
2019 stringpool_statistics ();
2020 dump_tree_statistics ();
2021 dump_rtx_statistics ();
2022 dump_varray_statistics ();
2023 dump_alloc_pool_statistics ();
2024 dump_bitmap_statistics ();
2025 dump_ggc_loc_statistics (final);
2028 /* Clean up: close opened files, etc. */
2030 static void
2031 finalize (void)
2033 /* Close the dump files. */
2034 if (flag_gen_aux_info)
2036 fclose (aux_info_file);
2037 if (errorcount)
2038 unlink (aux_info_file_name);
2041 /* Close non-debugging input and output files. Take special care to note
2042 whether fclose returns an error, since the pages might still be on the
2043 buffer chain while the file is open. */
2045 if (asm_out_file)
2047 if (ferror (asm_out_file) != 0)
2048 fatal_error ("error writing to %s: %m", asm_file_name);
2049 if (fclose (asm_out_file) != 0)
2050 fatal_error ("error closing %s: %m", asm_file_name);
2053 finish_optimization_passes ();
2055 if (mem_report)
2056 dump_memory_report (true);
2058 /* Free up memory for the benefit of leak detectors. */
2059 free_reg_info ();
2061 /* Language-specific end of compilation actions. */
2062 lang_hooks.finish ();
2065 /* Initialize the compiler, and compile the input file. */
2066 static void
2067 do_compile (void)
2069 /* Initialize timing first. The C front ends read the main file in
2070 the post_options hook, and C++ does file timings. */
2071 if (time_report || !quiet_flag || flag_detailed_statistics)
2072 timevar_init ();
2073 timevar_start (TV_TOTAL);
2075 process_options ();
2077 /* Don't do any more if an error has already occurred. */
2078 if (!errorcount)
2080 /* This must be run always, because it is needed to compute the FP
2081 predefined macros, such as __LDBL_MAX__, for targets using non
2082 default FP formats. */
2083 init_adjust_machine_modes ();
2085 /* Set up the back-end if requested. */
2086 if (!no_backend)
2087 backend_init ();
2089 /* Language-dependent initialization. Returns true on success. */
2090 if (lang_dependent_init (main_input_filename))
2091 compile_file ();
2093 finalize ();
2096 /* Stop timing and print the times. */
2097 timevar_stop (TV_TOTAL);
2098 timevar_print (stderr);
2101 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2102 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2103 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2105 It is not safe to call this function more than once. */
2108 toplev_main (unsigned int argc, const char **argv)
2110 save_argv = argv;
2112 /* Initialization of GCC's environment, and diagnostics. */
2113 general_init (argv[0]);
2115 /* Parse the options and do minimal processing; basically just
2116 enough to default flags appropriately. */
2117 decode_options (argc, argv);
2119 randomize ();
2121 /* Exit early if we can (e.g. -help). */
2122 if (!exit_after_options)
2123 do_compile ();
2125 if (errorcount || sorrycount)
2126 return (FATAL_EXIT_CODE);
2128 return (SUCCESS_EXIT_CODE);