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))
767 if (flag_unit_at_a_time
768 && cgraph_varpool_node (decl)->finalized)
770 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
772 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
774 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
776 else if (DECL_COMDAT (decl))
778 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
779 && (optimize || !flag_keep_static_consts
780 || DECL_ARTIFICIAL (decl)))
786 rest_of_decl_compilation (decl, NULL, 1, 1);
792 output_something = 1;
796 return output_something;
799 /* Issue appropriate warnings for the global declarations in VEC (of
800 which there are LEN). Output debugging information for them. */
803 check_global_declarations (tree *vec, int len)
808 for (i = 0; i < len; i++)
812 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
813 && ! TREE_ASM_WRITTEN (decl))
814 /* Cancel the RTL for this decl so that, if debugging info
815 output for global variables is still to come,
816 this one will be omitted. */
817 SET_DECL_RTL (decl, NULL_RTX);
819 /* Warn about any function
820 declared static but not defined.
821 We don't warn about variables,
822 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_PUBLIC (decl)
829 && (warn_unused_function
830 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
832 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
833 pedwarn ("%J'%F' used but never defined", decl, decl);
835 warning ("%J'%F' declared `static' but never defined", decl, decl);
836 /* This symbol is effectively an "extern" declaration now. */
837 TREE_PUBLIC (decl) = 1;
838 assemble_external (decl);
841 /* Warn about static fns or vars defined but not used. */
842 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
843 /* We don't warn about "static const" variables because the
844 "rcs_id" idiom uses that construction. */
845 || (warn_unused_variable
846 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
847 && ! DECL_IN_SYSTEM_HEADER (decl)
848 && ! TREE_USED (decl)
849 /* The TREE_USED bit for file-scope decls is kept in the identifier,
850 to handle multiple external decls in different scopes. */
851 && ! TREE_USED (DECL_NAME (decl))
852 && ! DECL_EXTERNAL (decl)
853 && ! TREE_PUBLIC (decl)
854 /* A volatile variable might be used in some non-obvious way. */
855 && ! TREE_THIS_VOLATILE (decl)
856 /* Global register variables must be declared to reserve them. */
857 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
858 /* Otherwise, ask the language. */
859 && lang_hooks.decls.warn_unused_global (decl))
860 warning ("%J'%D' defined but not used", decl, decl);
862 /* Avoid confusing the debug information machinery when there are
864 if (errorcount == 0 && sorrycount == 0)
866 timevar_push (TV_SYMOUT);
867 (*debug_hooks->global_decl) (decl);
868 timevar_pop (TV_SYMOUT);
873 /* Warn about a use of an identifier which was marked deprecated. */
875 warn_deprecated_use (tree node)
877 if (node == 0 || !warn_deprecated_decl)
881 warning ("`%s' is deprecated (declared at %s:%d)",
882 IDENTIFIER_POINTER (DECL_NAME (node)),
883 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
884 else if (TYPE_P (node))
886 const char *what = NULL;
887 tree decl = TYPE_STUB_DECL (node);
889 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
890 what = IDENTIFIER_POINTER (TYPE_NAME (node));
891 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
892 && DECL_NAME (TYPE_NAME (node)))
893 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
898 warning ("`%s' is deprecated (declared at %s:%d)", what,
899 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
901 warning ("`%s' is deprecated", what);
904 warning ("type is deprecated (declared at %s:%d)",
905 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
907 warning ("type is deprecated");
911 /* Save the current INPUT_LOCATION on the top entry in the
912 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
913 INPUT_LOCATION accordingly. */
916 push_srcloc (const char *file, int line)
918 struct file_stack *fs;
920 fs = xmalloc (sizeof (struct file_stack));
921 fs->location = input_location;
922 fs->next = input_file_stack;
923 input_filename = file;
925 input_file_stack = fs;
926 input_file_stack_tick++;
929 /* Pop the top entry off the stack of presently open source files.
930 Restore the INPUT_LOCATION from the new topmost entry on the
936 struct file_stack *fs;
938 fs = input_file_stack;
939 input_location = fs->location;
940 input_file_stack = fs->next;
942 input_file_stack_tick++;
945 /* Compile an entire translation unit. Write a file of assembly
946 output and various debugging dumps. */
951 /* Initialize yet another pass. */
953 init_final (main_input_filename);
954 coverage_init (aux_base_name);
956 timevar_push (TV_PARSE);
958 /* Call the parser, which parses the entire file (calling
959 rest_of_compilation for each function). */
960 lang_hooks.parse_file (set_yydebug);
962 /* In case there were missing block closers,
963 get us back to the global binding level. */
964 lang_hooks.clear_binding_stack ();
966 /* Compilation is now finished except for writing
967 what's left of the symbol table output. */
968 timevar_pop (TV_PARSE);
970 if (flag_syntax_only)
973 lang_hooks.decls.final_write_globals ();
975 cgraph_varpool_assemble_pending_decls ();
977 /* This must occur after the loop to output deferred functions.
978 Else the coverage initializer would not be emitted if all the
979 functions in this compilation unit were deferred. */
982 /* Write out any pending weak symbol declarations. */
986 /* Do dbx symbols. */
987 timevar_push (TV_SYMOUT);
989 #ifdef DWARF2_UNWIND_INFO
990 if (dwarf2out_do_frame ())
991 dwarf2out_frame_finish ();
994 (*debug_hooks->finish) (main_input_filename);
995 timevar_pop (TV_SYMOUT);
997 /* Output some stuff at end of file if nec. */
999 dw2_output_indirect_constants ();
1001 /* Attach a special .ident directive to the end of the file to identify
1002 the version of GCC which compiled this code. The format of the .ident
1003 string is patterned after the ones produced by native SVR4 compilers. */
1006 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1007 IDENT_ASM_OP, version_string);
1010 /* This must be at the end. Some target ports emit end of file directives
1011 into the assembly file here, and hence we can not output anything to the
1012 assembly file after this point. */
1013 targetm.asm_out.file_end ();
1016 /* Display help for target options. */
1018 display_target_options (void)
1021 static bool displayed = false;
1023 /* Avoid double printing for --help --target-help. */
1029 if (ARRAY_SIZE (target_switches) > 1
1030 #ifdef TARGET_OPTIONS
1031 || ARRAY_SIZE (target_options) > 1
1039 printf (_("\nTarget specific options:\n"));
1041 for (i = ARRAY_SIZE (target_switches); i--;)
1043 const char *option = target_switches[i].name;
1044 const char *description = target_switches[i].description;
1046 if (option == NULL || *option == 0)
1048 else if (description == NULL)
1053 printf (_(" -m%-23s [undocumented]\n"), option);
1055 else if (*description != 0)
1056 doc += printf (" -m%-23s %s\n", option, _(description));
1059 #ifdef TARGET_OPTIONS
1060 for (i = ARRAY_SIZE (target_options); i--;)
1062 const char *option = target_options[i].prefix;
1063 const char *description = target_options[i].description;
1065 if (option == NULL || *option == 0)
1067 else if (description == NULL)
1072 printf (_(" -m%-23s [undocumented]\n"), option);
1074 else if (*description != 0)
1075 doc += printf (" -m%-23s %s\n", option, _(description));
1081 printf (_("\nThere are undocumented target specific options as well.\n"));
1083 printf (_(" They exist, but they are not documented.\n"));
1088 /* Parse a -d... command line switch. */
1091 decode_d_option (const char *arg)
1102 flag_print_asm_name = 1;
1105 flag_dump_rtl_in_asm = 1;
1106 flag_print_asm_name = 1;
1109 graph_dump_format = vcg;
1112 rtl_dump_and_exit = 1;
1117 case 'D': /* These are handled by the preprocessor. */
1121 setup_core_dumping();
1126 if (!enable_rtl_dump_file (c))
1127 warning ("unrecognized gcc debugging option: %c", c);
1132 /* Indexed by enum debug_info_type. */
1133 const char *const debug_type_names[] =
1135 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
1138 /* Decode -m switches. */
1139 /* Decode the switch -mNAME. */
1142 set_target_switch (const char *name)
1145 int valid_target_option = 0;
1147 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1148 if (!strcmp (target_switches[j].name, name))
1150 if (target_switches[j].value < 0)
1151 target_flags &= ~-target_switches[j].value;
1153 target_flags |= target_switches[j].value;
1156 if (target_switches[j].value < 0)
1157 target_flags_explicit |= -target_switches[j].value;
1159 target_flags_explicit |= target_switches[j].value;
1161 valid_target_option = 1;
1164 #ifdef TARGET_OPTIONS
1165 if (!valid_target_option)
1166 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1168 int len = strlen (target_options[j].prefix);
1169 if (target_options[j].value)
1171 if (!strcmp (target_options[j].prefix, name))
1173 *target_options[j].variable = target_options[j].value;
1174 valid_target_option = 1;
1179 if (!strncmp (target_options[j].prefix, name, len))
1181 *target_options[j].variable = name + len;
1182 valid_target_option = 1;
1188 if (!valid_target_option)
1189 error ("invalid option `%s'", name);
1192 /* Print version information to FILE.
1193 Each line begins with INDENT (for the case where FILE is the
1194 assembler output file). */
1197 print_version (FILE *file, const char *indent)
1200 #define __VERSION__ "[?]"
1204 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1206 "%s%s%s version %s (%s) compiled by CC.\n"
1208 , indent, *indent != 0 ? " " : "",
1209 lang_hooks.name, version_string, TARGET_NAME,
1210 indent, __VERSION__);
1211 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1212 indent, *indent != 0 ? " " : "",
1213 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1216 /* Print an option value and return the adjusted position in the line.
1217 ??? We don't handle error returns from fprintf (disk full); presumably
1218 other code will catch a disk full though. */
1221 print_single_switch (FILE *file, int pos, int max,
1222 const char *indent, const char *sep, const char *term,
1223 const char *type, const char *name)
1225 /* The ultrix fprintf returns 0 on success, so compute the result we want
1226 here since we need it for the following test. */
1227 int len = strlen (sep) + strlen (type) + strlen (name);
1232 fprintf (file, "%s", term);
1237 fprintf (file, "%s", indent);
1238 pos = strlen (indent);
1240 fprintf (file, "%s%s%s", sep, type, name);
1245 /* Print active target switches to FILE.
1246 POS is the current cursor position and MAX is the size of a "line".
1247 Each line begins with INDENT and ends with TERM.
1248 Each switch is separated from the next by SEP. */
1251 print_switch_values (FILE *file, int pos, int max,
1252 const char *indent, const char *sep, const char *term)
1257 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1258 that it can be printed below. This helps reproducibility. */
1261 /* Print the options as passed. */
1262 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1263 _("options passed: "), "");
1265 for (p = &save_argv[1]; *p != NULL; p++)
1269 if (strcmp (*p, "-o") == 0)
1275 if (strcmp (*p, "-quiet") == 0)
1277 if (strcmp (*p, "-version") == 0)
1282 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1285 fprintf (file, "%s", term);
1287 /* Print the -f and -m options that have been enabled.
1288 We don't handle language specific options but printing argv
1291 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1292 _("options enabled: "), "");
1294 for (j = 0; j < cl_options_count; j++)
1296 if (!cl_options[j].flag_var
1297 || !(cl_options[j].flags & CL_REPORT))
1300 if (cl_options[j].has_set_value)
1302 if (*cl_options[j].flag_var != cl_options[j].set_value)
1307 if (!*cl_options[j].flag_var)
1311 pos = print_single_switch (file, pos, max, indent, sep, term,
1312 "", cl_options[j].opt_text);
1315 /* Print target specific options. */
1317 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1318 if (target_switches[j].name[0] != '\0'
1319 && target_switches[j].value > 0
1320 && ((target_switches[j].value & target_flags)
1321 == target_switches[j].value))
1323 pos = print_single_switch (file, pos, max, indent, sep, term,
1324 "-m", target_switches[j].name);
1327 #ifdef TARGET_OPTIONS
1328 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1329 if (*target_options[j].variable != NULL)
1332 sprintf (prefix, "-m%s", target_options[j].prefix);
1333 pos = print_single_switch (file, pos, max, indent, sep, term,
1334 prefix, *target_options[j].variable);
1338 fprintf (file, "%s", term);
1341 /* Open assembly code output file. Do this even if -fsyntax-only is
1342 on, because then the driver will have provided the name of a
1343 temporary file or bit bucket for us. NAME is the file specified on
1344 the command line, possibly NULL. */
1346 init_asm_output (const char *name)
1348 if (name == NULL && asm_file_name == 0)
1349 asm_out_file = stdout;
1352 if (asm_file_name == 0)
1354 int len = strlen (dump_base_name);
1355 char *dumpname = xmalloc (len + 6);
1356 memcpy (dumpname, dump_base_name, len + 1);
1357 strip_off_ending (dumpname, len);
1358 strcat (dumpname, ".s");
1359 asm_file_name = dumpname;
1361 if (!strcmp (asm_file_name, "-"))
1362 asm_out_file = stdout;
1364 asm_out_file = fopen (asm_file_name, "w+b");
1365 if (asm_out_file == 0)
1366 fatal_error ("can't open %s for writing: %m", asm_file_name);
1369 #ifdef IO_BUFFER_SIZE
1370 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
1371 _IOFBF, IO_BUFFER_SIZE);
1374 if (!flag_syntax_only)
1376 targetm.asm_out.file_start ();
1378 #ifdef ASM_COMMENT_START
1379 if (flag_verbose_asm)
1381 /* Print the list of options in effect. */
1382 print_version (asm_out_file, ASM_COMMENT_START);
1383 print_switch_values (asm_out_file, 0, MAX_LINE,
1384 ASM_COMMENT_START, " ", "\n");
1385 /* Add a blank line here so it appears in assembler output but not
1387 fprintf (asm_out_file, "\n");
1393 /* Default version of get_pch_validity.
1394 By default, every flag difference is fatal; that will be mostly right for
1395 most targets, but completely right for very few. */
1398 default_get_pch_validity (size_t *len)
1400 #ifdef TARGET_OPTIONS
1405 *len = sizeof (target_flags) + 2;
1406 #ifdef TARGET_OPTIONS
1407 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1410 if (*target_options[i].variable)
1411 *len += strlen (*target_options[i].variable);
1415 result = r = xmalloc (*len);
1419 memcpy (r, &target_flags, sizeof (target_flags));
1420 r += sizeof (target_flags);
1422 #ifdef TARGET_OPTIONS
1423 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1425 const char *str = *target_options[i].variable;
1429 l = strlen (str) + 1;
1438 /* Default version of pch_valid_p. */
1441 default_pch_valid_p (const void *data_p, size_t len)
1443 const char *data = (const char *)data_p;
1444 const char *flag_that_differs = NULL;
1447 /* -fpic and -fpie also usually make a PCH invalid. */
1448 if (data[0] != flag_pic)
1449 return _("created and used with different settings of -fpic");
1450 if (data[1] != flag_pie)
1451 return _("created and used with different settings of -fpie");
1454 /* Check target_flags. */
1455 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
1457 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
1462 memcpy (&tf, data, sizeof (target_flags));
1464 bits = target_switches[i].value;
1467 if ((target_flags & bits) != (tf & bits))
1469 flag_that_differs = target_switches[i].name;
1475 data += sizeof (target_flags);
1476 len -= sizeof (target_flags);
1478 /* Check string options. */
1479 #ifdef TARGET_OPTIONS
1480 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1482 const char *str = *target_options[i].variable;
1486 l = strlen (str) + 1;
1487 if (len < l || memcmp (data, str, l) != 0)
1489 flag_that_differs = target_options[i].prefix;
1502 asprintf (&r, _("created and used with differing settings of `-m%s'"),
1505 return _("out of memory");
1510 /* Default tree printer. Handles declarations only. */
1512 default_tree_printer (pretty_printer * pp, text_info *text)
1514 switch (*text->format_spec)
1520 tree t = va_arg (*text->args_ptr, tree);
1521 const char *n = DECL_NAME (t)
1522 ? lang_hooks.decl_printable_name (t, 2)
1533 /* Initialization of the front end environment, before command line
1534 options are parsed. Signal handlers, internationalization etc.
1535 ARGV0 is main's argv[0]. */
1537 general_init (const char *argv0)
1541 p = argv0 + strlen (argv0);
1542 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1546 xmalloc_set_program_name (progname);
1550 gcc_init_libintl ();
1552 /* Initialize the diagnostics reporting machinery, so option parsing
1553 can give warnings and errors. */
1554 diagnostic_initialize (global_dc);
1555 /* Set a default printer. Language specific initializations will
1556 override it later. */
1557 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1559 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1561 signal (SIGSEGV, crash_signal);
1564 signal (SIGILL, crash_signal);
1567 signal (SIGBUS, crash_signal);
1570 signal (SIGABRT, crash_signal);
1572 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1573 signal (SIGIOT, crash_signal);
1576 signal (SIGFPE, crash_signal);
1579 /* Other host-specific signal setup. */
1580 (*host_hooks.extra_signals)();
1582 /* Initialize the garbage-collector, string pools and tree type hash
1586 linemap_init (&line_table);
1589 /* Initialize register usage now so switches may override. */
1592 /* Register the language-independent parameters. */
1593 add_params (lang_independent_params, LAST_PARAM);
1595 /* This must be done after add_params but before argument processing. */
1596 init_ggc_heuristics();
1597 init_tree_optimization_passes ();
1600 /* Process the options that have been parsed. */
1602 process_options (void)
1604 /* Allow the front end to perform consistency checks and do further
1605 initialization based on the command line options. This hook also
1606 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1607 so we can correctly initialize debug output. */
1608 no_backend = lang_hooks.post_options (&main_input_filename);
1609 input_filename = main_input_filename;
1611 #ifdef OVERRIDE_OPTIONS
1612 /* Some machines may reject certain combinations of options. */
1616 if (flag_short_enums == 2)
1617 flag_short_enums = targetm.default_short_enums ();
1619 /* Set aux_base_name if not already set. */
1622 else if (main_input_filename)
1624 char *name = xstrdup (lbasename (main_input_filename));
1626 strip_off_ending (name, strlen (name));
1627 aux_base_name = name;
1630 aux_base_name = "gccaux";
1632 /* Set up the align_*_log variables, defaulting them to 1 if they
1633 were still unset. */
1634 if (align_loops <= 0) align_loops = 1;
1635 if (align_loops_max_skip > align_loops || !align_loops)
1636 align_loops_max_skip = align_loops - 1;
1637 align_loops_log = floor_log2 (align_loops * 2 - 1);
1638 if (align_jumps <= 0) align_jumps = 1;
1639 if (align_jumps_max_skip > align_jumps || !align_jumps)
1640 align_jumps_max_skip = align_jumps - 1;
1641 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1642 if (align_labels <= 0) align_labels = 1;
1643 align_labels_log = floor_log2 (align_labels * 2 - 1);
1644 if (align_labels_max_skip > align_labels || !align_labels)
1645 align_labels_max_skip = align_labels - 1;
1646 if (align_functions <= 0) align_functions = 1;
1647 align_functions_log = floor_log2 (align_functions * 2 - 1);
1649 /* Unrolling all loops implies that standard loop unrolling must also
1651 if (flag_unroll_all_loops)
1652 flag_unroll_loops = 1;
1654 if (flag_unroll_loops)
1656 flag_old_unroll_loops = 0;
1657 flag_old_unroll_all_loops = 0;
1660 if (flag_old_unroll_all_loops)
1661 flag_old_unroll_loops = 1;
1663 /* Old loop unrolling requires that strength_reduction be on also. Silently
1664 turn on strength reduction here if it isn't already on. Also, the loop
1665 unrolling code assumes that cse will be run after loop, so that must
1666 be turned on also. */
1667 if (flag_old_unroll_loops)
1669 flag_strength_reduce = 1;
1670 flag_rerun_cse_after_loop = 1;
1672 if (flag_unroll_loops || flag_peel_loops)
1673 flag_rerun_cse_after_loop = 1;
1675 if (flag_non_call_exceptions)
1676 flag_asynchronous_unwind_tables = 1;
1677 if (flag_asynchronous_unwind_tables)
1678 flag_unwind_tables = 1;
1680 /* Disable unit-at-a-time mode for frontends not supporting callgraph
1682 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
1683 flag_unit_at_a_time = 0;
1685 if (flag_value_profile_transformations)
1686 flag_profile_values = 1;
1688 /* Warn about options that are not supported on this machine. */
1689 #ifndef INSN_SCHEDULING
1690 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1691 warning ("instruction scheduling not supported on this target machine");
1694 if (flag_delayed_branch)
1695 warning ("this target machine does not have delayed branches");
1698 if (flag_tree_based_profiling && flag_test_coverage)
1699 sorry ("test-coverage not yet implemented in trees.");
1700 if (flag_tree_based_profiling && flag_profile_values)
1701 sorry ("value-based profiling not yet implemented in trees.");
1703 user_label_prefix = USER_LABEL_PREFIX;
1704 if (flag_leading_underscore != -1)
1706 /* If the default prefix is more complicated than "" or "_",
1707 issue a warning and ignore this option. */
1708 if (user_label_prefix[0] == 0 ||
1709 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1711 user_label_prefix = flag_leading_underscore ? "_" : "";
1714 warning ("-f%sleading-underscore not supported on this target machine",
1715 flag_leading_underscore ? "" : "no-");
1718 /* If we are in verbose mode, write out the version and maybe all the
1719 option flags in use. */
1722 print_version (stderr, "");
1724 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
1727 if (flag_syntax_only)
1729 write_symbols = NO_DEBUG;
1733 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1735 if (debug_info_level == DINFO_LEVEL_NONE)
1736 write_symbols = NO_DEBUG;
1738 /* Now we know write_symbols, set up the debug hooks based on it.
1739 By default we do nothing for debug output. */
1740 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1741 default_debug_hooks = &do_nothing_debug_hooks;
1742 #if defined(DBX_DEBUGGING_INFO)
1743 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1744 default_debug_hooks = &dbx_debug_hooks;
1746 #if defined(XCOFF_DEBUGGING_INFO)
1747 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1748 default_debug_hooks = &xcoff_debug_hooks;
1750 #ifdef SDB_DEBUGGING_INFO
1751 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1752 default_debug_hooks = &sdb_debug_hooks;
1754 #ifdef DWARF2_DEBUGGING_INFO
1755 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1756 default_debug_hooks = &dwarf2_debug_hooks;
1758 #ifdef VMS_DEBUGGING_INFO
1759 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1760 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1761 default_debug_hooks = &vmsdbg_debug_hooks;
1764 if (write_symbols == NO_DEBUG)
1765 debug_hooks = &do_nothing_debug_hooks;
1766 #if defined(DBX_DEBUGGING_INFO)
1767 else if (write_symbols == DBX_DEBUG)
1768 debug_hooks = &dbx_debug_hooks;
1770 #if defined(XCOFF_DEBUGGING_INFO)
1771 else if (write_symbols == XCOFF_DEBUG)
1772 debug_hooks = &xcoff_debug_hooks;
1774 #ifdef SDB_DEBUGGING_INFO
1775 else if (write_symbols == SDB_DEBUG)
1776 debug_hooks = &sdb_debug_hooks;
1778 #ifdef DWARF2_DEBUGGING_INFO
1779 else if (write_symbols == DWARF2_DEBUG)
1780 debug_hooks = &dwarf2_debug_hooks;
1782 #ifdef VMS_DEBUGGING_INFO
1783 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1784 debug_hooks = &vmsdbg_debug_hooks;
1787 error ("target system does not support the \"%s\" debug format",
1788 debug_type_names[write_symbols]);
1790 /* Now we know which debug output will be used so we can set
1791 flag_var_tracking, flag_rename_registers and flag_web if the user has
1792 not specified them. */
1793 if (debug_info_level < DINFO_LEVEL_NORMAL
1794 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1796 if (flag_var_tracking == 1)
1798 if (debug_info_level < DINFO_LEVEL_NORMAL)
1799 warning ("variable tracking requested, but useless unless "
1800 "producing debug info");
1802 warning ("variable tracking requested, but not supported "
1803 "by this debug format");
1805 flag_var_tracking = 0;
1808 if (flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING)
1809 flag_rename_registers = default_debug_hooks->var_location
1810 != do_nothing_debug_hooks.var_location;
1812 if (flag_web == AUTODETECT_FLAG_VAR_TRACKING)
1813 flag_web = optimize >= 2 && (default_debug_hooks->var_location
1814 != do_nothing_debug_hooks.var_location);
1816 if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING)
1817 flag_var_tracking = optimize >= 1;
1819 /* If auxiliary info generation is desired, open the output file.
1820 This goes in the same directory as the source file--unlike
1821 all the other output files. */
1822 if (flag_gen_aux_info)
1824 aux_info_file = fopen (aux_info_file_name, "w");
1825 if (aux_info_file == 0)
1826 fatal_error ("can't open %s: %m", aux_info_file_name);
1829 if (! targetm.have_named_sections)
1831 if (flag_function_sections)
1833 warning ("-ffunction-sections not supported for this target");
1834 flag_function_sections = 0;
1836 if (flag_data_sections)
1838 warning ("-fdata-sections not supported for this target");
1839 flag_data_sections = 0;
1843 if (flag_function_sections && profile_flag)
1845 warning ("-ffunction-sections disabled; it makes profiling impossible");
1846 flag_function_sections = 0;
1849 #ifndef HAVE_prefetch
1850 if (flag_prefetch_loop_arrays)
1852 warning ("-fprefetch-loop-arrays not supported for this target");
1853 flag_prefetch_loop_arrays = 0;
1856 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1858 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
1859 flag_prefetch_loop_arrays = 0;
1863 /* This combination of options isn't handled for i386 targets and doesn't
1864 make much sense anyway, so don't allow it. */
1865 if (flag_prefetch_loop_arrays && optimize_size)
1867 warning ("-fprefetch-loop-arrays is not supported with -Os");
1868 flag_prefetch_loop_arrays = 0;
1871 #ifndef OBJECT_FORMAT_ELF
1872 if (flag_function_sections && write_symbols != NO_DEBUG)
1873 warning ("-ffunction-sections may affect debugging on some targets");
1876 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1877 if (flag_signaling_nans)
1878 flag_trapping_math = 1;
1881 /* Initialize the compiler back end. */
1885 init_adjust_machine_modes ();
1887 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
1888 || debug_info_level == DINFO_LEVEL_VERBOSE
1889 #ifdef VMS_DEBUGGING_INFO
1890 /* Enable line number info for traceback. */
1891 || debug_info_level > DINFO_LEVEL_NONE
1893 || flag_test_coverage
1894 || warn_notreached);
1897 init_fake_stack_mems ();
1901 init_function_once ();
1902 init_varasm_once ();
1904 /* The following initialization functions need to generate rtl, so
1905 provide a dummy function context for them. */
1906 init_dummy_function_start ();
1908 if (flag_caller_saves)
1909 init_caller_save ();
1910 expand_dummy_function_end ();
1913 /* Language-dependent initialization. Returns nonzero on success. */
1915 lang_dependent_init (const char *name)
1917 if (dump_base_name == 0)
1918 dump_base_name = name ? name : "gccdump";
1920 /* Other front-end initialization. */
1921 if (lang_hooks.init () == 0)
1924 init_asm_output (name);
1926 /* These create various _DECL nodes, so need to be called after the
1927 front end is initialized. */
1930 init_optimization_passes ();
1932 /* The following initialization functions need to generate rtl, so
1933 provide a dummy function context for them. */
1934 init_dummy_function_start ();
1936 expand_dummy_function_end ();
1938 /* If dbx symbol table desired, initialize writing it and output the
1939 predefined types. */
1940 timevar_push (TV_SYMOUT);
1942 #ifdef DWARF2_UNWIND_INFO
1943 if (dwarf2out_do_frame ())
1944 dwarf2out_frame_init ();
1947 /* Now we have the correct original filename, we can initialize
1949 (*debug_hooks->init) (name);
1951 timevar_pop (TV_SYMOUT);
1956 /* Clean up: close opened files, etc. */
1961 /* Close the dump files. */
1962 if (flag_gen_aux_info)
1964 fclose (aux_info_file);
1966 unlink (aux_info_file_name);
1969 /* Close non-debugging input and output files. Take special care to note
1970 whether fclose returns an error, since the pages might still be on the
1971 buffer chain while the file is open. */
1975 if (ferror (asm_out_file) != 0)
1976 fatal_error ("error writing to %s: %m", asm_file_name);
1977 if (fclose (asm_out_file) != 0)
1978 fatal_error ("error closing %s: %m", asm_file_name);
1981 finish_optimization_passes ();
1985 ggc_print_statistics ();
1986 stringpool_statistics ();
1987 dump_tree_statistics ();
1988 dump_rtx_statistics ();
1989 dump_varray_statistics ();
1990 dump_alloc_pool_statistics ();
1991 dump_ggc_loc_statistics ();
1994 /* Free up memory for the benefit of leak detectors. */
1997 /* Language-specific end of compilation actions. */
1998 lang_hooks.finish ();
2001 /* Initialize the compiler, and compile the input file. */
2005 /* Initialize timing first. The C front ends read the main file in
2006 the post_options hook, and C++ does file timings. */
2007 if (time_report || !quiet_flag || flag_detailed_statistics)
2009 timevar_start (TV_TOTAL);
2013 /* Don't do any more if an error has already occurred. */
2016 /* Set up the back-end if requested. */
2020 /* Language-dependent initialization. Returns true on success. */
2021 if (lang_dependent_init (main_input_filename))
2027 /* Stop timing and print the times. */
2028 timevar_stop (TV_TOTAL);
2029 timevar_print (stderr);
2032 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2033 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2034 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2036 It is not safe to call this function more than once. */
2039 toplev_main (unsigned int argc, const char **argv)
2043 /* Initialization of GCC's environment, and diagnostics. */
2044 general_init (argv[0]);
2046 /* Parse the options and do minimal processing; basically just
2047 enough to default flags appropriately. */
2048 decode_options (argc, argv);
2052 /* Exit early if we can (e.g. -help). */
2053 if (!exit_after_options)
2056 if (errorcount || sorrycount)
2057 return (FATAL_EXIT_CODE);
2059 return (SUCCESS_EXIT_CODE);