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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
50 #include "insn-attr.h"
51 #include "insn-config.h"
52 #include "insn-flags.h"
53 #include "hard-reg-set.h"
60 #include "basic-block.h"
67 #include "diagnostic.h"
70 #include "dwarf2asm.h"
71 #include "integrate.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
77 #include "tree-alias-common.h"
79 #include "hosthooks.h"
83 #include "value-prof.h"
84 #include "alloc-pool.h"
86 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
87 #include "dwarf2out.h"
90 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
94 #ifdef SDB_DEBUGGING_INFO
98 #ifdef XCOFF_DEBUGGING_INFO
99 #include "xcoffout.h" /* Needed for external data
100 declarations for e.g. AIX 4.x. */
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. */
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 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
144 to optimize and default_debug_hooks in process_options (). */
145 #define AUTODETECT_FLAG_VAR_TRACKING 2
147 /* Current position in real source file. */
149 location_t input_location;
151 struct line_maps line_table;
153 /* Nonzero if it is unsafe to create any new pseudo registers. */
156 /* Stack of currently pending input files. */
158 struct file_stack *input_file_stack;
160 /* Incremented on each change to input_file_stack. */
161 int input_file_stack_tick;
163 /* Name to use as base of names for dump output files. */
165 const char *dump_base_name;
167 /* Name to use as a base for auxiliary output files. */
169 const char *aux_base_name;
171 /* Bit flags that specify the machine subtype we are compiling for.
172 Bits are tested using macros TARGET_... defined in the tm.h file
173 and set by `-m...' switches. Must be defined in rtlanal.c. */
175 extern int target_flags;
177 /* A mask of target_flags that includes bit X if X was set or cleared
178 on the command line. */
180 int target_flags_explicit;
182 /* Debug hooks - dependent upon command line options. */
184 const struct gcc_debug_hooks *debug_hooks;
186 /* Debug hooks - target default. */
188 static const struct gcc_debug_hooks *default_debug_hooks;
190 /* Other flags saying which kinds of debugging dump have been requested. */
192 int rtl_dump_and_exit;
193 int flag_print_asm_name;
194 enum graph_dump_types graph_dump_format;
196 /* Name for output file of assembly code, specified with -o. */
198 const char *asm_file_name;
200 /* Nonzero means do optimizations. -O.
201 Particular numeric values stand for particular amounts of optimization;
202 thus, -O2 stores 2 here. However, the optimizations beyond the basic
203 ones are not controlled directly by this variable. Instead, they are
204 controlled by individual `flag_...' variables that are defaulted
205 based on this variable. */
209 /* Nonzero means optimize for size. -Os.
210 The only valid values are zero and nonzero. When optimize_size is
211 nonzero, optimize defaults to 2, but certain individual code
212 bloating optimizations are disabled. */
214 int optimize_size = 0;
216 /* The FUNCTION_DECL for the function currently being compiled,
217 or 0 if between functions. */
218 tree current_function_decl;
220 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
222 tree current_function_func_begin_label;
224 /* A DECL for the current file-scope context. When using IMA, this heads a
225 chain of FILE_DECLs; currently only C uses it. */
227 tree current_file_decl;
229 /* Temporarily suppress certain warnings.
230 This is set while reading code from a system header file. */
232 int in_system_header = 0;
234 /* Nonzero means to collect statistics which might be expensive
235 and to print them when we are done. */
236 int flag_detailed_statistics = 0;
238 /* A random sequence of characters, unless overridden by user. */
239 const char *flag_random_seed;
241 /* A local time stamp derived from the time of compilation. It will be
242 zero if the system cannot provide a time. It will be -1u, if the
243 user has specified a particular random seed. */
248 /* Nonzero means `char' should be signed. */
250 int flag_signed_char;
252 /* Nonzero means give an enum type only as many bytes as it needs. A value
253 of 2 means it has not yet been initialized. */
255 int flag_short_enums;
257 /* Nonzero if structures and unions should be returned in memory.
259 This should only be defined if compatibility with another compiler or
260 with an ABI is needed, because it results in slower code. */
262 #ifndef DEFAULT_PCC_STRUCT_RETURN
263 #define DEFAULT_PCC_STRUCT_RETURN 1
266 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
268 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
270 /* 0 means straightforward implementation of complex divide acceptable.
271 1 means wide ranges of inputs must work for complex divide.
272 2 means C99-like requirements for complex divide (not yet implemented). */
274 int flag_complex_divide_method = 0;
276 /* Nonzero means performs web construction pass. When flag_web ==
277 AUTODETECT_FLAG_VAR_TRACKING it will be set according to optimize
278 and default_debug_hooks in process_options (). */
280 int flag_web = AUTODETECT_FLAG_VAR_TRACKING;
282 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
283 not just because the tree inliner turned us off. */
285 int flag_really_no_inline = 2;
287 /* Nonzero means we should be saving declaration info into a .X file. */
289 int flag_gen_aux_info = 0;
291 /* Specified name of aux-info file. */
293 const char *aux_info_file_name;
295 /* Nonzero if we are compiling code for a shared library, zero for
300 /* Set to the default thread-local storage (tls) model to use. */
302 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
304 /* Nonzero means change certain warnings into errors.
305 Usually these are warnings about failure to conform to some standard. */
307 int flag_pedantic_errors = 0;
309 /* -dA causes debug commentary information to be produced in
310 the generated assembly code (to make it more readable). This option
311 is generally only of use to those who actually need to read the
312 generated assembly code (perhaps while debugging the compiler itself).
313 Currently, this switch is only used by dwarfout.c; however, it is intended
314 to be a catchall for printing debug information in the assembler file. */
316 int flag_debug_asm = 0;
318 /* -dP causes the rtl to be emitted as a comment in assembly. */
320 int flag_dump_rtl_in_asm = 0;
322 /* When non-NULL, indicates that whenever space is allocated on the
323 stack, the resulting stack pointer must not pass this
324 address---that is, for stacks that grow downward, the stack pointer
325 must always be greater than or equal to this address; for stacks
326 that grow upward, the stack pointer must be less than this address.
327 At present, the rtx may be either a REG or a SYMBOL_REF, although
328 the support provided depends on the backend. */
331 /* If one, renumber instruction UIDs to reduce the number of
332 unused UIDs if there are a lot of instructions. If greater than
333 one, unconditionally renumber instruction UIDs. */
334 int flag_renumber_insns = 1;
336 /* Enable points-to analysis on trees. */
337 enum pta_type flag_tree_points_to = PTA_NONE;
339 /* Nonzero if we should track variables. When
340 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
341 to optimize, debug_info_level and debug_hooks in process_options (). */
342 int flag_var_tracking = AUTODETECT_FLAG_VAR_TRACKING;
344 /* Values of the -falign-* flags: how much to align labels in code.
345 0 means `use default', 1 means `don't align'.
346 For each variable, there is an _log variant which is the power
347 of two not less than the variable, for .align output. */
350 int align_loops_max_skip;
352 int align_jumps_max_skip;
353 int align_labels_log;
354 int align_labels_max_skip;
355 int align_functions_log;
357 /* Like align_functions_log above, but used by front-ends to force the
358 minimum function alignment. Zero means no alignment is forced. */
359 int force_align_functions_log;
363 const char *const string;
367 lang_independent_options;
369 /* Nonzero if subexpressions must be evaluated from left-to-right. */
370 int flag_evaluation_order = 0;
372 /* The user symbol prefix after having resolved same. */
373 const char *user_label_prefix;
375 static const param_info lang_independent_params[] = {
376 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
377 { OPTION, DEFAULT, HELP },
378 #include "params.def"
383 /* Here is a table, controlled by the tm.h file, listing each -m switch
384 and which bits in `target_switches' it should set or clear.
385 If VALUE is positive, it is bits to set.
386 If VALUE is negative, -VALUE is bits to clear.
387 (The sign bit is not used so there is no confusion.) */
391 const char *const name;
393 const char *const description;
395 target_switches[] = TARGET_SWITCHES;
397 /* This table is similar, but allows the switch to have a value. */
399 #ifdef TARGET_OPTIONS
402 const char *const prefix;
403 const char **const variable;
404 const char *const description;
405 const char *const value;
407 target_options[] = TARGET_OPTIONS;
410 /* Nonzero means warn about function definitions that default the return type
411 or that use a null return and have a return-type other than void. */
413 int warn_return_type;
415 /* Output files for assembler code (real compiler output)
416 and debugging dumps. */
420 FILE *dump_file = NULL;
421 FILE *cgraph_dump_file = NULL;
423 /* The current working directory of a translation. It's generally the
424 directory from which compilation was initiated, but a preprocessed
425 file may specify the original directory in which it was
428 static const char *src_pwd;
430 /* Initialize src_pwd with the given string, and return true. If it
431 was already initialized, return false. As a special case, it may
432 be called with a NULL argument to test whether src_pwd has NOT been
436 set_src_pwd (const char *pwd)
440 if (strcmp (src_pwd, pwd) == 0)
446 src_pwd = xstrdup (pwd);
450 /* Return the directory from which the translation unit was initiated,
451 in case set_src_pwd() was not called before to assign it a
463 /* Called when the start of a function definition is parsed,
464 this function prints on stderr the name of the function. */
466 announce_function (tree decl)
470 if (rtl_dump_and_exit)
471 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
473 verbatim (" %s", lang_hooks.decl_printable_name (decl, 2));
475 pp_needs_newline (global_dc->printer) = true;
476 diagnostic_set_last_function (global_dc);
480 /* Set up a default flag_random_seed and local_tick, unless the user
481 already specified one. */
486 if (!flag_random_seed)
488 unsigned HOST_WIDE_INT value;
489 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
491 /* Get some more or less random data. */
492 #ifdef HAVE_GETTIMEOFDAY
496 gettimeofday (&tv, NULL);
497 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
501 time_t now = time (NULL);
503 if (now != (time_t)-1)
504 local_tick = (unsigned) now;
507 value = local_tick ^ getpid ();
509 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
510 flag_random_seed = random_seed;
512 else if (!local_tick)
517 /* Decode the string P as an integral parameter.
518 If the string is indeed an integer return its numeric value else
519 issue an Invalid Option error for the option PNAME and return DEFVAL.
520 If PNAME is zero just return DEFVAL, do not call error. */
523 read_integral_parameter (const char *p, const char *pname, const int defval)
525 const char *endp = p;
538 error ("invalid option argument `%s'", pname);
545 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
546 If X is 0, return -1.
548 This should be used via the floor_log2 macro. */
551 floor_log2_wide (unsigned HOST_WIDE_INT x)
556 if (sizeof (HOST_WIDE_INT) * 8 > 64)
557 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
559 if (sizeof (HOST_WIDE_INT) * 8 > 32)
560 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
562 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
564 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
566 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
568 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
570 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
575 /* Return the logarithm of X, base 2, considering X unsigned,
576 if X is a power of 2. Otherwise, returns -1.
578 This should be used via the `exact_log2' macro. */
581 exact_log2_wide (unsigned HOST_WIDE_INT x)
583 /* Test for 0 or a power of 2. */
584 if (x == 0 || x != (x & -x))
586 return floor_log2_wide (x);
589 /* Handler for fatal signals, such as SIGSEGV. These are transformed
590 into ICE messages, which is much more user friendly. In case the
591 error printer crashes, reset the signal to prevent infinite recursion. */
594 crash_signal (int signo)
596 signal (signo, SIG_DFL);
597 internal_error ("%s", strsignal (signo));
600 /* Arrange to dump core on error. (The regular error message is still
601 printed first, except in the case of abort().) */
604 setup_core_dumping (void)
607 signal (SIGABRT, SIG_DFL);
609 #if defined(HAVE_SETRLIMIT)
612 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
613 fatal_error ("getting core file size maximum limit: %m");
614 rlim.rlim_cur = rlim.rlim_max;
615 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
616 fatal_error ("setting core file size limit to maximum: %m");
619 diagnostic_abort_on_error (global_dc);
623 /* Strip off a legitimate source ending from the input string NAME of
624 length LEN. Rather than having to know the names used by all of
625 our front ends, we strip off an ending of a period followed by
626 up to five characters. (Java uses ".class".) */
629 strip_off_ending (char *name, int len)
632 for (i = 2; i < 6 && len > i; i++)
634 if (name[len - i] == '.')
636 name[len - i] = '\0';
642 /* Output a quoted string. */
645 output_quoted_string (FILE *asm_file, const char *string)
647 #ifdef OUTPUT_QUOTED_STRING
648 OUTPUT_QUOTED_STRING (asm_file, string);
652 putc ('\"', asm_file);
653 while ((c = *string++) != 0)
657 if (c == '\"' || c == '\\')
658 putc ('\\', asm_file);
662 fprintf (asm_file, "\\%03o", (unsigned char) c);
664 putc ('\"', asm_file);
668 /* Output a file name in the form wanted by System V. */
671 output_file_directive (FILE *asm_file, const char *input_name)
676 if (input_name == NULL)
677 input_name = "<stdin>";
679 len = strlen (input_name);
680 na = input_name + len;
682 /* NA gets INPUT_NAME sans directory names. */
683 while (na > input_name)
685 if (IS_DIR_SEPARATOR (na[-1]))
690 #ifdef ASM_OUTPUT_SOURCE_FILENAME
691 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
693 fprintf (asm_file, "\t.file\t");
694 output_quoted_string (asm_file, na);
695 fputc ('\n', asm_file);
699 /* Do any final processing required for the declarations in VEC, of
700 which there are LEN. We write out inline functions and variables
701 that have been deferred until this point, but which are required.
702 Returns nonzero if anything was put out. */
705 wrapup_global_declarations (tree *vec, int len)
710 int output_something = 0;
712 for (i = 0; i < len; i++)
716 /* We're not deferring this any longer. Assignment is
717 conditional to avoid needlessly dirtying PCH pages. */
718 if (DECL_DEFER_OUTPUT (decl) != 0)
719 DECL_DEFER_OUTPUT (decl) = 0;
721 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
722 lang_hooks.finish_incomplete_decl (decl);
725 /* Now emit any global variables or functions that we have been
726 putting off. We need to loop in case one of the things emitted
727 here references another one which comes earlier in the list. */
731 for (i = 0; i < len; i++)
735 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
738 /* Don't write out static consts, unless we still need them.
740 We also keep static consts if not optimizing (for debugging),
741 unless the user specified -fno-keep-static-consts.
742 ??? They might be better written into the debug information.
743 This is possible when using DWARF.
745 A language processor that wants static constants to be always
746 written out (even if it is not used) is responsible for
747 calling rest_of_decl_compilation itself. E.g. the C front-end
748 calls rest_of_decl_compilation from finish_decl.
749 One motivation for this is that is conventional in some
750 environments to write things like:
751 static const char rcsid[] = "... version string ...";
752 intending to force the string to be in the executable.
754 A language processor that would prefer to have unneeded
755 static constants "optimized away" would just defer writing
756 them out until here. E.g. C++ does this, because static
757 constants are often defined in header files.
759 ??? A tempting alternative (for both C and C++) would be
760 to force a constant to be written if and only if it is
761 defined in a main file, as opposed to an include file. */
763 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
765 struct cgraph_varpool_node *node;
767 node = cgraph_varpool_node (decl);
769 if (flag_unit_at_a_time && node->finalized)
771 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
773 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
775 else if (node->needed)
777 else if (DECL_COMDAT (decl))
779 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
780 && (optimize || !flag_keep_static_consts
781 || DECL_ARTIFICIAL (decl)))
787 rest_of_decl_compilation (decl, NULL, 1, 1);
793 output_something = 1;
797 return output_something;
800 /* Issue appropriate warnings for the global declarations in VEC (of
801 which there are LEN). Output debugging information for them. */
804 check_global_declarations (tree *vec, int len)
809 for (i = 0; i < len; i++)
813 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
814 && ! TREE_ASM_WRITTEN (decl))
815 /* Cancel the RTL for this decl so that, if debugging info
816 output for global variables is still to come,
817 this one will be omitted. */
818 SET_DECL_RTL (decl, NULL_RTX);
820 /* Warn about any function
821 declared static but not defined.
822 We don't warn about variables,
823 because many programs have static variables
824 that exist only to get some text into the object file. */
825 if (TREE_CODE (decl) == FUNCTION_DECL
826 && DECL_INITIAL (decl) == 0
827 && DECL_EXTERNAL (decl)
828 && ! DECL_ARTIFICIAL (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 ("%J'%F' used but never defined", decl, decl);
836 warning ("%J'%F' declared `static' but never defined", decl, 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 && ! 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 ("%J'%D' defined but not used", decl, decl);
863 /* Avoid confusing the debug information machinery when there are
865 if (errorcount == 0 && sorrycount == 0)
867 timevar_push (TV_SYMOUT);
868 (*debug_hooks->global_decl) (decl);
869 timevar_pop (TV_SYMOUT);
874 /* Warn about a use of an identifier which was marked deprecated. */
876 warn_deprecated_use (tree node)
878 if (node == 0 || !warn_deprecated_decl)
882 warning ("`%s' is deprecated (declared at %s:%d)",
883 IDENTIFIER_POINTER (DECL_NAME (node)),
884 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
885 else if (TYPE_P (node))
887 const char *what = NULL;
888 tree decl = TYPE_STUB_DECL (node);
890 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
891 what = IDENTIFIER_POINTER (TYPE_NAME (node));
892 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
893 && DECL_NAME (TYPE_NAME (node)))
894 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
899 warning ("`%s' is deprecated (declared at %s:%d)", what,
900 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
902 warning ("`%s' is deprecated", what);
905 warning ("type is deprecated (declared at %s:%d)",
906 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
908 warning ("type is deprecated");
912 /* Save the current INPUT_LOCATION on the top entry in the
913 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
914 INPUT_LOCATION accordingly. */
917 push_srcloc (const char *file, int line)
919 struct file_stack *fs;
921 fs = xmalloc (sizeof (struct file_stack));
922 fs->location = input_location;
923 fs->next = input_file_stack;
924 input_filename = file;
926 input_file_stack = fs;
927 input_file_stack_tick++;
930 /* Pop the top entry off the stack of presently open source files.
931 Restore the INPUT_LOCATION from the new topmost entry on the
937 struct file_stack *fs;
939 fs = input_file_stack;
940 input_location = fs->location;
941 input_file_stack = fs->next;
943 input_file_stack_tick++;
946 /* Compile an entire translation unit. Write a file of assembly
947 output and various debugging dumps. */
952 /* Initialize yet another pass. */
954 init_final (main_input_filename);
955 coverage_init (aux_base_name);
957 timevar_push (TV_PARSE);
959 /* Call the parser, which parses the entire file (calling
960 rest_of_compilation for each function). */
961 lang_hooks.parse_file (set_yydebug);
963 /* In case there were missing block closers,
964 get us back to the global binding level. */
965 lang_hooks.clear_binding_stack ();
967 /* Compilation is now finished except for writing
968 what's left of the symbol table output. */
969 timevar_pop (TV_PARSE);
971 if (flag_syntax_only)
974 lang_hooks.decls.final_write_globals ();
976 cgraph_varpool_assemble_pending_decls ();
978 /* This must occur after the loop to output deferred functions.
979 Else the coverage initializer would not be emitted if all the
980 functions in this compilation unit were deferred. */
983 /* Write out any pending weak symbol declarations. */
987 /* Do dbx symbols. */
988 timevar_push (TV_SYMOUT);
990 #ifdef DWARF2_UNWIND_INFO
991 if (dwarf2out_do_frame ())
992 dwarf2out_frame_finish ();
995 (*debug_hooks->finish) (main_input_filename);
996 timevar_pop (TV_SYMOUT);
998 /* Output some stuff at end of file if nec. */
1000 dw2_output_indirect_constants ();
1002 /* Attach a special .ident directive to the end of the file to identify
1003 the version of GCC which compiled this code. The format of the .ident
1004 string is patterned after the ones produced by native SVR4 compilers. */
1007 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1008 IDENT_ASM_OP, version_string);
1011 /* This must be at the end. Some target ports emit end of file directives
1012 into the assembly file here, and hence we can not output anything to the
1013 assembly file after this point. */
1014 targetm.asm_out.file_end ();
1017 /* Display help for target options. */
1019 display_target_options (void)
1022 static bool displayed = false;
1024 /* Avoid double printing for --help --target-help. */
1030 if (ARRAY_SIZE (target_switches) > 1
1031 #ifdef TARGET_OPTIONS
1032 || ARRAY_SIZE (target_options) > 1
1040 printf (_("\nTarget specific options:\n"));
1042 for (i = ARRAY_SIZE (target_switches); i--;)
1044 const char *option = target_switches[i].name;
1045 const char *description = target_switches[i].description;
1047 if (option == NULL || *option == 0)
1049 else if (description == NULL)
1054 printf (_(" -m%-23s [undocumented]\n"), option);
1056 else if (*description != 0)
1057 doc += printf (" -m%-23s %s\n", option, _(description));
1060 #ifdef TARGET_OPTIONS
1061 for (i = ARRAY_SIZE (target_options); i--;)
1063 const char *option = target_options[i].prefix;
1064 const char *description = target_options[i].description;
1066 if (option == NULL || *option == 0)
1068 else if (description == NULL)
1073 printf (_(" -m%-23s [undocumented]\n"), option);
1075 else if (*description != 0)
1076 doc += printf (" -m%-23s %s\n", option, _(description));
1082 printf (_("\nThere are undocumented target specific options as well.\n"));
1084 printf (_(" They exist, but they are not documented.\n"));
1089 /* Parse a -d... command line switch. */
1092 decode_d_option (const char *arg)
1103 flag_print_asm_name = 1;
1106 flag_dump_rtl_in_asm = 1;
1107 flag_print_asm_name = 1;
1110 graph_dump_format = vcg;
1113 rtl_dump_and_exit = 1;
1118 case 'D': /* These are handled by the preprocessor. */
1122 setup_core_dumping();
1127 if (!enable_rtl_dump_file (c))
1128 warning ("unrecognized gcc debugging option: %c", c);
1133 /* Indexed by enum debug_info_type. */
1134 const char *const debug_type_names[] =
1136 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
1139 /* Decode -m switches. */
1140 /* Decode the switch -mNAME. */
1143 set_target_switch (const char *name)
1146 int valid_target_option = 0;
1148 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1149 if (!strcmp (target_switches[j].name, name))
1151 if (target_switches[j].value < 0)
1152 target_flags &= ~-target_switches[j].value;
1154 target_flags |= target_switches[j].value;
1157 if (target_switches[j].value < 0)
1158 target_flags_explicit |= -target_switches[j].value;
1160 target_flags_explicit |= target_switches[j].value;
1162 valid_target_option = 1;
1165 #ifdef TARGET_OPTIONS
1166 if (!valid_target_option)
1167 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1169 int len = strlen (target_options[j].prefix);
1170 if (target_options[j].value)
1172 if (!strcmp (target_options[j].prefix, name))
1174 *target_options[j].variable = target_options[j].value;
1175 valid_target_option = 1;
1180 if (!strncmp (target_options[j].prefix, name, len))
1182 *target_options[j].variable = name + len;
1183 valid_target_option = 1;
1189 if (!valid_target_option)
1190 error ("invalid option `%s'", name);
1193 /* Print version information to FILE.
1194 Each line begins with INDENT (for the case where FILE is the
1195 assembler output file). */
1198 print_version (FILE *file, const char *indent)
1201 #define __VERSION__ "[?]"
1205 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1207 "%s%s%s version %s (%s) compiled by CC.\n"
1209 , indent, *indent != 0 ? " " : "",
1210 lang_hooks.name, version_string, TARGET_NAME,
1211 indent, __VERSION__);
1212 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1213 indent, *indent != 0 ? " " : "",
1214 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1217 /* Print an option value and return the adjusted position in the line.
1218 ??? We don't handle error returns from fprintf (disk full); presumably
1219 other code will catch a disk full though. */
1222 print_single_switch (FILE *file, int pos, int max,
1223 const char *indent, const char *sep, const char *term,
1224 const char *type, const char *name)
1226 /* The ultrix fprintf returns 0 on success, so compute the result we want
1227 here since we need it for the following test. */
1228 int len = strlen (sep) + strlen (type) + strlen (name);
1233 fprintf (file, "%s", term);
1238 fprintf (file, "%s", indent);
1239 pos = strlen (indent);
1241 fprintf (file, "%s%s%s", sep, type, name);
1246 /* Print active target switches to FILE.
1247 POS is the current cursor position and MAX is the size of a "line".
1248 Each line begins with INDENT and ends with TERM.
1249 Each switch is separated from the next by SEP. */
1252 print_switch_values (FILE *file, int pos, int max,
1253 const char *indent, const char *sep, const char *term)
1258 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1259 that it can be printed below. This helps reproducibility. */
1262 /* Print the options as passed. */
1263 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1264 _("options passed: "), "");
1266 for (p = &save_argv[1]; *p != NULL; p++)
1270 if (strcmp (*p, "-o") == 0)
1276 if (strcmp (*p, "-quiet") == 0)
1278 if (strcmp (*p, "-version") == 0)
1283 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1286 fprintf (file, "%s", term);
1288 /* Print the -f and -m options that have been enabled.
1289 We don't handle language specific options but printing argv
1292 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1293 _("options enabled: "), "");
1295 for (j = 0; j < cl_options_count; j++)
1297 if (!cl_options[j].flag_var
1298 || !(cl_options[j].flags & CL_REPORT))
1301 if (cl_options[j].has_set_value)
1303 if (*cl_options[j].flag_var != cl_options[j].set_value)
1308 if (!*cl_options[j].flag_var)
1312 pos = print_single_switch (file, pos, max, indent, sep, term,
1313 "", cl_options[j].opt_text);
1316 /* Print target specific options. */
1318 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1319 if (target_switches[j].name[0] != '\0'
1320 && target_switches[j].value > 0
1321 && ((target_switches[j].value & target_flags)
1322 == target_switches[j].value))
1324 pos = print_single_switch (file, pos, max, indent, sep, term,
1325 "-m", target_switches[j].name);
1328 #ifdef TARGET_OPTIONS
1329 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1330 if (*target_options[j].variable != NULL)
1333 sprintf (prefix, "-m%s", target_options[j].prefix);
1334 pos = print_single_switch (file, pos, max, indent, sep, term,
1335 prefix, *target_options[j].variable);
1339 fprintf (file, "%s", term);
1342 /* Open assembly code output file. Do this even if -fsyntax-only is
1343 on, because then the driver will have provided the name of a
1344 temporary file or bit bucket for us. NAME is the file specified on
1345 the command line, possibly NULL. */
1347 init_asm_output (const char *name)
1349 if (name == NULL && asm_file_name == 0)
1350 asm_out_file = stdout;
1353 if (asm_file_name == 0)
1355 int len = strlen (dump_base_name);
1356 char *dumpname = xmalloc (len + 6);
1357 memcpy (dumpname, dump_base_name, len + 1);
1358 strip_off_ending (dumpname, len);
1359 strcat (dumpname, ".s");
1360 asm_file_name = dumpname;
1362 if (!strcmp (asm_file_name, "-"))
1363 asm_out_file = stdout;
1365 asm_out_file = fopen (asm_file_name, "w+b");
1366 if (asm_out_file == 0)
1367 fatal_error ("can't open %s for writing: %m", asm_file_name);
1370 #ifdef IO_BUFFER_SIZE
1371 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
1372 _IOFBF, IO_BUFFER_SIZE);
1375 if (!flag_syntax_only)
1377 targetm.asm_out.file_start ();
1379 #ifdef ASM_COMMENT_START
1380 if (flag_verbose_asm)
1382 /* Print the list of options in effect. */
1383 print_version (asm_out_file, ASM_COMMENT_START);
1384 print_switch_values (asm_out_file, 0, MAX_LINE,
1385 ASM_COMMENT_START, " ", "\n");
1386 /* Add a blank line here so it appears in assembler output but not
1388 fprintf (asm_out_file, "\n");
1394 /* Default version of get_pch_validity.
1395 By default, every flag difference is fatal; that will be mostly right for
1396 most targets, but completely right for very few. */
1399 default_get_pch_validity (size_t *len)
1401 #ifdef TARGET_OPTIONS
1406 *len = sizeof (target_flags) + 2;
1407 #ifdef TARGET_OPTIONS
1408 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1411 if (*target_options[i].variable)
1412 *len += strlen (*target_options[i].variable);
1416 result = r = xmalloc (*len);
1420 memcpy (r, &target_flags, sizeof (target_flags));
1421 r += sizeof (target_flags);
1423 #ifdef TARGET_OPTIONS
1424 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1426 const char *str = *target_options[i].variable;
1430 l = strlen (str) + 1;
1439 /* Default version of pch_valid_p. */
1442 default_pch_valid_p (const void *data_p, size_t len)
1444 const char *data = (const char *)data_p;
1445 const char *flag_that_differs = NULL;
1448 /* -fpic and -fpie also usually make a PCH invalid. */
1449 if (data[0] != flag_pic)
1450 return _("created and used with different settings of -fpic");
1451 if (data[1] != flag_pie)
1452 return _("created and used with different settings of -fpie");
1455 /* Check target_flags. */
1456 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
1458 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
1463 memcpy (&tf, data, sizeof (target_flags));
1465 bits = target_switches[i].value;
1468 if ((target_flags & bits) != (tf & bits))
1470 flag_that_differs = target_switches[i].name;
1476 data += sizeof (target_flags);
1477 len -= sizeof (target_flags);
1479 /* Check string options. */
1480 #ifdef TARGET_OPTIONS
1481 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1483 const char *str = *target_options[i].variable;
1487 l = strlen (str) + 1;
1488 if (len < l || memcmp (data, str, l) != 0)
1490 flag_that_differs = target_options[i].prefix;
1503 asprintf (&r, _("created and used with differing settings of `-m%s'"),
1506 return _("out of memory");
1511 /* Default tree printer. Handles declarations only. */
1513 default_tree_printer (pretty_printer * pp, text_info *text)
1515 switch (*text->format_spec)
1521 tree t = va_arg (*text->args_ptr, tree);
1522 const char *n = DECL_NAME (t)
1523 ? lang_hooks.decl_printable_name (t, 2)
1534 /* Initialization of the front end environment, before command line
1535 options are parsed. Signal handlers, internationalization etc.
1536 ARGV0 is main's argv[0]. */
1538 general_init (const char *argv0)
1542 p = argv0 + strlen (argv0);
1543 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1547 xmalloc_set_program_name (progname);
1551 gcc_init_libintl ();
1553 /* Initialize the diagnostics reporting machinery, so option parsing
1554 can give warnings and errors. */
1555 diagnostic_initialize (global_dc);
1556 /* Set a default printer. Language specific initializations will
1557 override it later. */
1558 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1560 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1562 signal (SIGSEGV, crash_signal);
1565 signal (SIGILL, crash_signal);
1568 signal (SIGBUS, crash_signal);
1571 signal (SIGABRT, crash_signal);
1573 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1574 signal (SIGIOT, crash_signal);
1577 signal (SIGFPE, crash_signal);
1580 /* Other host-specific signal setup. */
1581 (*host_hooks.extra_signals)();
1583 /* Initialize the garbage-collector, string pools and tree type hash
1587 linemap_init (&line_table);
1590 /* Initialize register usage now so switches may override. */
1593 /* Register the language-independent parameters. */
1594 add_params (lang_independent_params, LAST_PARAM);
1596 /* This must be done after add_params but before argument processing. */
1597 init_ggc_heuristics();
1598 init_tree_optimization_passes ();
1601 /* Process the options that have been parsed. */
1603 process_options (void)
1605 /* Allow the front end to perform consistency checks and do further
1606 initialization based on the command line options. This hook also
1607 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1608 so we can correctly initialize debug output. */
1609 no_backend = lang_hooks.post_options (&main_input_filename);
1610 input_filename = main_input_filename;
1612 #ifdef OVERRIDE_OPTIONS
1613 /* Some machines may reject certain combinations of options. */
1617 if (flag_short_enums == 2)
1618 flag_short_enums = targetm.default_short_enums ();
1620 /* Set aux_base_name if not already set. */
1623 else if (main_input_filename)
1625 char *name = xstrdup (lbasename (main_input_filename));
1627 strip_off_ending (name, strlen (name));
1628 aux_base_name = name;
1631 aux_base_name = "gccaux";
1633 /* Set up the align_*_log variables, defaulting them to 1 if they
1634 were still unset. */
1635 if (align_loops <= 0) align_loops = 1;
1636 if (align_loops_max_skip > align_loops || !align_loops)
1637 align_loops_max_skip = align_loops - 1;
1638 align_loops_log = floor_log2 (align_loops * 2 - 1);
1639 if (align_jumps <= 0) align_jumps = 1;
1640 if (align_jumps_max_skip > align_jumps || !align_jumps)
1641 align_jumps_max_skip = align_jumps - 1;
1642 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1643 if (align_labels <= 0) align_labels = 1;
1644 align_labels_log = floor_log2 (align_labels * 2 - 1);
1645 if (align_labels_max_skip > align_labels || !align_labels)
1646 align_labels_max_skip = align_labels - 1;
1647 if (align_functions <= 0) align_functions = 1;
1648 align_functions_log = floor_log2 (align_functions * 2 - 1);
1650 /* Unrolling all loops implies that standard loop unrolling must also
1652 if (flag_unroll_all_loops)
1653 flag_unroll_loops = 1;
1655 if (flag_unroll_loops)
1657 flag_old_unroll_loops = 0;
1658 flag_old_unroll_all_loops = 0;
1661 if (flag_old_unroll_all_loops)
1662 flag_old_unroll_loops = 1;
1664 /* Old loop unrolling requires that strength_reduction be on also. Silently
1665 turn on strength reduction here if it isn't already on. Also, the loop
1666 unrolling code assumes that cse will be run after loop, so that must
1667 be turned on also. */
1668 if (flag_old_unroll_loops)
1670 flag_strength_reduce = 1;
1671 flag_rerun_cse_after_loop = 1;
1673 if (flag_unroll_loops || flag_peel_loops)
1674 flag_rerun_cse_after_loop = 1;
1676 /* If explicitly asked to run new loop optimizer, switch off the old
1678 if (flag_loop_optimize2)
1679 flag_loop_optimize = 0;
1681 /* Enable new loop optimizer pass if any of its optimizations is called. */
1682 if (flag_move_loop_invariants
1683 || flag_unswitch_loops
1685 || flag_unroll_loops
1686 || flag_branch_on_count_reg)
1687 flag_loop_optimize2 = 1;
1689 if (flag_non_call_exceptions)
1690 flag_asynchronous_unwind_tables = 1;
1691 if (flag_asynchronous_unwind_tables)
1692 flag_unwind_tables = 1;
1694 /* Disable unit-at-a-time mode for frontends not supporting callgraph
1696 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
1697 flag_unit_at_a_time = 0;
1699 if (flag_value_profile_transformations)
1700 flag_profile_values = 1;
1702 /* Warn about options that are not supported on this machine. */
1703 #ifndef INSN_SCHEDULING
1704 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1705 warning ("instruction scheduling not supported on this target machine");
1708 if (flag_delayed_branch)
1709 warning ("this target machine does not have delayed branches");
1712 if (flag_tree_based_profiling && flag_test_coverage)
1713 sorry ("test-coverage not yet implemented in trees.");
1714 if (flag_tree_based_profiling && flag_profile_values)
1715 sorry ("value-based profiling not yet implemented in trees.");
1717 user_label_prefix = USER_LABEL_PREFIX;
1718 if (flag_leading_underscore != -1)
1720 /* If the default prefix is more complicated than "" or "_",
1721 issue a warning and ignore this option. */
1722 if (user_label_prefix[0] == 0 ||
1723 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1725 user_label_prefix = flag_leading_underscore ? "_" : "";
1728 warning ("-f%sleading-underscore not supported on this target machine",
1729 flag_leading_underscore ? "" : "no-");
1732 /* If we are in verbose mode, write out the version and maybe all the
1733 option flags in use. */
1736 print_version (stderr, "");
1738 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
1741 if (flag_syntax_only)
1743 write_symbols = NO_DEBUG;
1747 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1749 if (debug_info_level == DINFO_LEVEL_NONE)
1750 write_symbols = NO_DEBUG;
1752 /* Now we know write_symbols, set up the debug hooks based on it.
1753 By default we do nothing for debug output. */
1754 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1755 default_debug_hooks = &do_nothing_debug_hooks;
1756 #if defined(DBX_DEBUGGING_INFO)
1757 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1758 default_debug_hooks = &dbx_debug_hooks;
1760 #if defined(XCOFF_DEBUGGING_INFO)
1761 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1762 default_debug_hooks = &xcoff_debug_hooks;
1764 #ifdef SDB_DEBUGGING_INFO
1765 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1766 default_debug_hooks = &sdb_debug_hooks;
1768 #ifdef DWARF2_DEBUGGING_INFO
1769 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1770 default_debug_hooks = &dwarf2_debug_hooks;
1772 #ifdef VMS_DEBUGGING_INFO
1773 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1774 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1775 default_debug_hooks = &vmsdbg_debug_hooks;
1778 if (write_symbols == NO_DEBUG)
1779 debug_hooks = &do_nothing_debug_hooks;
1780 #if defined(DBX_DEBUGGING_INFO)
1781 else if (write_symbols == DBX_DEBUG)
1782 debug_hooks = &dbx_debug_hooks;
1784 #if defined(XCOFF_DEBUGGING_INFO)
1785 else if (write_symbols == XCOFF_DEBUG)
1786 debug_hooks = &xcoff_debug_hooks;
1788 #ifdef SDB_DEBUGGING_INFO
1789 else if (write_symbols == SDB_DEBUG)
1790 debug_hooks = &sdb_debug_hooks;
1792 #ifdef DWARF2_DEBUGGING_INFO
1793 else if (write_symbols == DWARF2_DEBUG)
1794 debug_hooks = &dwarf2_debug_hooks;
1796 #ifdef VMS_DEBUGGING_INFO
1797 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1798 debug_hooks = &vmsdbg_debug_hooks;
1801 error ("target system does not support the \"%s\" debug format",
1802 debug_type_names[write_symbols]);
1804 /* Now we know which debug output will be used so we can set
1805 flag_var_tracking, flag_rename_registers and flag_web if the user has
1806 not specified them. */
1807 if (debug_info_level < DINFO_LEVEL_NORMAL
1808 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1810 if (flag_var_tracking == 1)
1812 if (debug_info_level < DINFO_LEVEL_NORMAL)
1813 warning ("variable tracking requested, but useless unless "
1814 "producing debug info");
1816 warning ("variable tracking requested, but not supported "
1817 "by this debug format");
1819 flag_var_tracking = 0;
1822 if (flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING)
1823 flag_rename_registers = default_debug_hooks->var_location
1824 != do_nothing_debug_hooks.var_location;
1826 if (flag_web == AUTODETECT_FLAG_VAR_TRACKING)
1827 flag_web = optimize >= 2 && (default_debug_hooks->var_location
1828 != do_nothing_debug_hooks.var_location);
1830 if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING)
1831 flag_var_tracking = optimize >= 1;
1833 /* If auxiliary info generation is desired, open the output file.
1834 This goes in the same directory as the source file--unlike
1835 all the other output files. */
1836 if (flag_gen_aux_info)
1838 aux_info_file = fopen (aux_info_file_name, "w");
1839 if (aux_info_file == 0)
1840 fatal_error ("can't open %s: %m", aux_info_file_name);
1843 if (! targetm.have_named_sections)
1845 if (flag_function_sections)
1847 warning ("-ffunction-sections not supported for this target");
1848 flag_function_sections = 0;
1850 if (flag_data_sections)
1852 warning ("-fdata-sections not supported for this target");
1853 flag_data_sections = 0;
1857 if (flag_function_sections && profile_flag)
1859 warning ("-ffunction-sections disabled; it makes profiling impossible");
1860 flag_function_sections = 0;
1863 #ifndef HAVE_prefetch
1864 if (flag_prefetch_loop_arrays)
1866 warning ("-fprefetch-loop-arrays not supported for this target");
1867 flag_prefetch_loop_arrays = 0;
1870 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1872 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
1873 flag_prefetch_loop_arrays = 0;
1877 /* This combination of options isn't handled for i386 targets and doesn't
1878 make much sense anyway, so don't allow it. */
1879 if (flag_prefetch_loop_arrays && optimize_size)
1881 warning ("-fprefetch-loop-arrays is not supported with -Os");
1882 flag_prefetch_loop_arrays = 0;
1885 #ifndef OBJECT_FORMAT_ELF
1886 if (flag_function_sections && write_symbols != NO_DEBUG)
1887 warning ("-ffunction-sections may affect debugging on some targets");
1890 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1891 if (flag_signaling_nans)
1892 flag_trapping_math = 1;
1895 /* Initialize the compiler back end. */
1899 init_adjust_machine_modes ();
1901 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
1902 || debug_info_level == DINFO_LEVEL_VERBOSE
1903 #ifdef VMS_DEBUGGING_INFO
1904 /* Enable line number info for traceback. */
1905 || debug_info_level > DINFO_LEVEL_NONE
1907 || flag_test_coverage
1908 || warn_notreached);
1911 init_fake_stack_mems ();
1915 init_function_once ();
1916 init_varasm_once ();
1918 /* The following initialization functions need to generate rtl, so
1919 provide a dummy function context for them. */
1920 init_dummy_function_start ();
1922 if (flag_caller_saves)
1923 init_caller_save ();
1924 expand_dummy_function_end ();
1927 /* Language-dependent initialization. Returns nonzero on success. */
1929 lang_dependent_init (const char *name)
1931 if (dump_base_name == 0)
1932 dump_base_name = name ? name : "gccdump";
1934 /* Other front-end initialization. */
1935 if (lang_hooks.init () == 0)
1938 init_asm_output (name);
1940 /* These create various _DECL nodes, so need to be called after the
1941 front end is initialized. */
1944 init_optimization_passes ();
1946 /* The following initialization functions need to generate rtl, so
1947 provide a dummy function context for them. */
1948 init_dummy_function_start ();
1950 expand_dummy_function_end ();
1952 /* If dbx symbol table desired, initialize writing it and output the
1953 predefined types. */
1954 timevar_push (TV_SYMOUT);
1956 #ifdef DWARF2_UNWIND_INFO
1957 if (dwarf2out_do_frame ())
1958 dwarf2out_frame_init ();
1961 /* Now we have the correct original filename, we can initialize
1963 (*debug_hooks->init) (name);
1965 timevar_pop (TV_SYMOUT);
1970 /* Clean up: close opened files, etc. */
1975 /* Close the dump files. */
1976 if (flag_gen_aux_info)
1978 fclose (aux_info_file);
1980 unlink (aux_info_file_name);
1983 /* Close non-debugging input and output files. Take special care to note
1984 whether fclose returns an error, since the pages might still be on the
1985 buffer chain while the file is open. */
1989 if (ferror (asm_out_file) != 0)
1990 fatal_error ("error writing to %s: %m", asm_file_name);
1991 if (fclose (asm_out_file) != 0)
1992 fatal_error ("error closing %s: %m", asm_file_name);
1995 finish_optimization_passes ();
1999 ggc_print_statistics ();
2000 stringpool_statistics ();
2001 dump_tree_statistics ();
2002 dump_rtx_statistics ();
2003 dump_varray_statistics ();
2004 dump_alloc_pool_statistics ();
2005 dump_ggc_loc_statistics ();
2008 /* Free up memory for the benefit of leak detectors. */
2011 /* Language-specific end of compilation actions. */
2012 lang_hooks.finish ();
2015 /* Initialize the compiler, and compile the input file. */
2019 /* Initialize timing first. The C front ends read the main file in
2020 the post_options hook, and C++ does file timings. */
2021 if (time_report || !quiet_flag || flag_detailed_statistics)
2023 timevar_start (TV_TOTAL);
2027 /* Don't do any more if an error has already occurred. */
2030 /* Set up the back-end if requested. */
2034 /* Language-dependent initialization. Returns true on success. */
2035 if (lang_dependent_init (main_input_filename))
2041 /* Stop timing and print the times. */
2042 timevar_stop (TV_TOTAL);
2043 timevar_print (stderr);
2046 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2047 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2048 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2050 It is not safe to call this function more than once. */
2053 toplev_main (unsigned int argc, const char **argv)
2057 /* Initialization of GCC's environment, and diagnostics. */
2058 general_init (argv[0]);
2060 /* Parse the options and do minimal processing; basically just
2061 enough to default flags appropriately. */
2062 decode_options (argc, argv);
2066 /* Exit early if we can (e.g. -help). */
2067 if (!exit_after_options)
2070 if (errorcount || sorrycount)
2071 return (FATAL_EXIT_CODE);
2073 return (SUCCESS_EXIT_CODE);