1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 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"
66 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
81 #include "value-prof.h"
82 #include "alloc-pool.h"
83 #include "tree-mudflap.h"
85 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
86 #include "dwarf2out.h"
89 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
93 #ifdef SDB_DEBUGGING_INFO
97 #ifdef XCOFF_DEBUGGING_INFO
98 #include "xcoffout.h" /* Needed for external data
99 declarations for e.g. AIX 4.x. */
102 static void general_init (const char *);
103 static void do_compile (void);
104 static void process_options (void);
105 static void backend_init (void);
106 static int lang_dependent_init (const char *);
107 static void init_asm_output (const char *);
108 static void finalize (void);
110 static void crash_signal (int) ATTRIBUTE_NORETURN;
111 static void setup_core_dumping (void);
112 static void compile_file (void);
114 static int print_single_switch (FILE *, int, int, const char *,
115 const char *, const char *,
116 const char *, const char *);
117 static void print_switch_values (FILE *, int, int, const char *,
118 const char *, const char *);
120 /* Nonzero to dump debug info whilst parsing (-dy option). */
121 static int set_yydebug;
123 /* True if we don't need a backend (e.g. preprocessing only). */
124 static bool no_backend;
126 /* Length of line when printing switch values. */
129 /* Name of program invoked, sans directories. */
131 const char *progname;
133 /* Copy of argument vector to toplev_main. */
134 static const char **save_argv;
136 /* Name of top-level original source file (what was input to cpp).
137 This comes from the #-command at the beginning of the actual input.
138 If there isn't any there, then this is the cc1 input file name. */
140 const char *main_input_filename;
142 #ifndef USE_MAPPED_LOCATION
143 location_t unknown_location = { NULL, 0 };
146 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
147 to optimize and default_debug_hooks in process_options (). */
148 #define AUTODETECT_FLAG_VAR_TRACKING 2
150 /* Current position in real source file. */
152 location_t input_location;
154 struct line_maps line_table;
156 /* Nonzero if it is unsafe to create any new pseudo registers. */
159 /* Stack of currently pending input files. */
161 struct file_stack *input_file_stack;
163 /* Incremented on each change to input_file_stack. */
164 int input_file_stack_tick;
166 /* Name to use as base of names for dump output files. */
168 const char *dump_base_name;
170 /* Name to use as a base for auxiliary output files. */
172 const char *aux_base_name;
174 /* Bit flags that specify the machine subtype we are compiling for.
175 Bits are tested using macros TARGET_... defined in the tm.h file
176 and set by `-m...' switches. Must be defined in rtlanal.c. */
178 extern int target_flags;
180 /* A mask of target_flags that includes bit X if X was set or cleared
181 on the command line. */
183 int target_flags_explicit;
185 /* Debug hooks - dependent upon command line options. */
187 const struct gcc_debug_hooks *debug_hooks;
189 /* Debug hooks - target default. */
191 static const struct gcc_debug_hooks *default_debug_hooks;
193 /* Other flags saying which kinds of debugging dump have been requested. */
195 int rtl_dump_and_exit;
196 int flag_print_asm_name;
197 enum graph_dump_types graph_dump_format;
199 /* Name for output file of assembly code, specified with -o. */
201 const char *asm_file_name;
203 /* Nonzero means do optimizations. -O.
204 Particular numeric values stand for particular amounts of optimization;
205 thus, -O2 stores 2 here. However, the optimizations beyond the basic
206 ones are not controlled directly by this variable. Instead, they are
207 controlled by individual `flag_...' variables that are defaulted
208 based on this variable. */
212 /* Nonzero means optimize for size. -Os.
213 The only valid values are zero and nonzero. When optimize_size is
214 nonzero, optimize defaults to 2, but certain individual code
215 bloating optimizations are disabled. */
217 int optimize_size = 0;
219 /* The FUNCTION_DECL for the function currently being compiled,
220 or 0 if between functions. */
221 tree current_function_decl;
223 /* Set to the FUNC_BEGIN label of the current function, or NULL
225 const char * current_function_func_begin_label;
227 /* Temporarily suppress certain warnings.
228 This is set while reading code from a system header file. */
230 int in_system_header = 0;
232 /* Nonzero means to collect statistics which might be expensive
233 and to print them when we are done. */
234 int flag_detailed_statistics = 0;
236 /* A random sequence of characters, unless overridden by user. */
237 const char *flag_random_seed;
239 /* A local time stamp derived from the time of compilation. It will be
240 zero if the system cannot provide a time. It will be -1u, if the
241 user has specified a particular random seed. */
246 /* Nonzero means `char' should be signed. */
248 int flag_signed_char;
250 /* Nonzero means give an enum type only as many bytes as it needs. A value
251 of 2 means it has not yet been initialized. */
253 int flag_short_enums;
255 /* Nonzero if structures and unions should be returned in memory.
257 This should only be defined if compatibility with another compiler or
258 with an ABI is needed, because it results in slower code. */
260 #ifndef DEFAULT_PCC_STRUCT_RETURN
261 #define DEFAULT_PCC_STRUCT_RETURN 1
264 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
266 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
268 /* 0 means straightforward implementation of complex divide acceptable.
269 1 means wide ranges of inputs must work for complex divide.
270 2 means C99-like requirements for complex multiply and divide. */
272 int flag_complex_method = 1;
274 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
275 not just because the tree inliner turned us off. */
277 int flag_really_no_inline = 2;
279 /* Nonzero means we should be saving declaration info into a .X file. */
281 int flag_gen_aux_info = 0;
283 /* Specified name of aux-info file. */
285 const char *aux_info_file_name;
287 /* Nonzero if we are compiling code for a shared library, zero for
292 /* Set to the default thread-local storage (tls) model to use. */
294 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
296 /* Nonzero means change certain warnings into errors.
297 Usually these are warnings about failure to conform to some standard. */
299 int flag_pedantic_errors = 0;
301 /* -dA causes debug commentary information to be produced in
302 the generated assembly code (to make it more readable). This option
303 is generally only of use to those who actually need to read the
304 generated assembly code (perhaps while debugging the compiler itself).
305 Currently, this switch is only used by dwarfout.c; however, it is intended
306 to be a catchall for printing debug information in the assembler file. */
308 int flag_debug_asm = 0;
310 /* -dP causes the rtl to be emitted as a comment in assembly. */
312 int flag_dump_rtl_in_asm = 0;
314 /* When non-NULL, indicates that whenever space is allocated on the
315 stack, the resulting stack pointer must not pass this
316 address---that is, for stacks that grow downward, the stack pointer
317 must always be greater than or equal to this address; for stacks
318 that grow upward, the stack pointer must be less than this address.
319 At present, the rtx may be either a REG or a SYMBOL_REF, although
320 the support provided depends on the backend. */
323 /* If one, renumber instruction UIDs to reduce the number of
324 unused UIDs if there are a lot of instructions. If greater than
325 one, unconditionally renumber instruction UIDs. */
326 int flag_renumber_insns = 1;
328 /* Nonzero if we should track variables. When
329 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
330 to optimize, debug_info_level and debug_hooks in process_options (). */
331 int flag_var_tracking = AUTODETECT_FLAG_VAR_TRACKING;
333 /* True if the user has tagged the function with the 'section'
336 bool user_defined_section_attribute = false;
338 /* Values of the -falign-* flags: how much to align labels in code.
339 0 means `use default', 1 means `don't align'.
340 For each variable, there is an _log variant which is the power
341 of two not less than the variable, for .align output. */
344 int align_loops_max_skip;
346 int align_jumps_max_skip;
347 int align_labels_log;
348 int align_labels_max_skip;
349 int align_functions_log;
351 /* Like align_functions_log above, but used by front-ends to force the
352 minimum function alignment. Zero means no alignment is forced. */
353 int force_align_functions_log;
357 const char *const string;
361 lang_independent_options;
363 /* Nonzero if subexpressions must be evaluated from left-to-right. */
364 int flag_evaluation_order = 0;
366 /* The user symbol prefix after having resolved same. */
367 const char *user_label_prefix;
369 static const param_info lang_independent_params[] = {
370 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
371 { OPTION, DEFAULT, MIN, MAX, HELP },
372 #include "params.def"
374 { NULL, 0, 0, 0, NULL }
377 /* Here is a table, controlled by the tm.h file, listing each -m switch
378 and which bits in `target_switches' it should set or clear.
379 If VALUE is positive, it is bits to set.
380 If VALUE is negative, -VALUE is bits to clear.
381 (The sign bit is not used so there is no confusion.) */
385 const char *const name;
387 const char *const description;
389 target_switches[] = TARGET_SWITCHES;
391 /* This table is similar, but allows the switch to have a value. */
393 #ifdef TARGET_OPTIONS
396 const char *const prefix;
397 const char **const variable;
398 const char *const description;
399 const char *const value;
401 target_options[] = TARGET_OPTIONS;
404 /* Nonzero means warn about function definitions that default the return type
405 or that use a null return and have a return-type other than void. */
407 int warn_return_type;
409 /* Output files for assembler code (real compiler output)
410 and debugging dumps. */
414 FILE *dump_file = NULL;
415 const char *dump_file_name;
417 /* The current working directory of a translation. It's generally the
418 directory from which compilation was initiated, but a preprocessed
419 file may specify the original directory in which it was
422 static const char *src_pwd;
424 /* Initialize src_pwd with the given string, and return true. If it
425 was already initialized, return false. As a special case, it may
426 be called with a NULL argument to test whether src_pwd has NOT been
430 set_src_pwd (const char *pwd)
434 if (strcmp (src_pwd, pwd) == 0)
440 src_pwd = xstrdup (pwd);
444 /* Return the directory from which the translation unit was initiated,
445 in case set_src_pwd() was not called before to assign it a
461 /* Called when the start of a function definition is parsed,
462 this function prints on stderr the name of the function. */
464 announce_function (tree decl)
468 if (rtl_dump_and_exit)
469 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
471 verbatim (" %s", lang_hooks.decl_printable_name (decl, 2));
473 pp_needs_newline (global_dc->printer) = true;
474 diagnostic_set_last_function (global_dc);
478 /* Set up a default flag_random_seed and local_tick, unless the user
479 already specified one. */
484 if (!flag_random_seed)
486 unsigned HOST_WIDE_INT value;
487 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
489 /* Get some more or less random data. */
490 #ifdef HAVE_GETTIMEOFDAY
494 gettimeofday (&tv, NULL);
495 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
499 time_t now = time (NULL);
501 if (now != (time_t)-1)
502 local_tick = (unsigned) now;
505 value = local_tick ^ getpid ();
507 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
508 flag_random_seed = random_seed;
510 else if (!local_tick)
515 /* Decode the string P as an integral parameter.
516 If the string is indeed an integer return its numeric value else
517 issue an Invalid Option error for the option PNAME and return DEFVAL.
518 If PNAME is zero just return DEFVAL, do not call error. */
521 read_integral_parameter (const char *p, const char *pname, const int defval)
523 const char *endp = p;
536 error ("invalid option argument %qs", pname);
543 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
544 If X is 0, return -1. */
547 floor_log2 (unsigned HOST_WIDE_INT x)
555 t = HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x);
557 if (HOST_BITS_PER_WIDE_INT > 64)
558 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
560 if (HOST_BITS_PER_WIDE_INT > 32)
561 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
563 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
565 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
567 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
569 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
571 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
578 /* Return the logarithm of X, base 2, considering X unsigned,
579 if X is a power of 2. Otherwise, returns -1. */
582 exact_log2 (unsigned HOST_WIDE_INT x)
587 return x ? CTZ_HWI (x) : -1;
589 return floor_log2 (x);
593 /* Handler for fatal signals, such as SIGSEGV. These are transformed
594 into ICE messages, which is much more user friendly. In case the
595 error printer crashes, reset the signal to prevent infinite recursion. */
598 crash_signal (int signo)
600 signal (signo, SIG_DFL);
602 /* If we crashed while processing an ASM statement, then be a little more
603 graceful. It's most likely the user's fault. */
604 if (this_is_asm_operands)
606 output_operand_lossage ("unrecoverable error");
607 exit (FATAL_EXIT_CODE);
610 internal_error ("%s", strsignal (signo));
613 /* Arrange to dump core on error. (The regular error message is still
614 printed first, except in the case of abort().) */
617 setup_core_dumping (void)
620 signal (SIGABRT, SIG_DFL);
622 #if defined(HAVE_SETRLIMIT)
625 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
626 fatal_error ("getting core file size maximum limit: %m");
627 rlim.rlim_cur = rlim.rlim_max;
628 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
629 fatal_error ("setting core file size limit to maximum: %m");
632 diagnostic_abort_on_error (global_dc);
636 /* Strip off a legitimate source ending from the input string NAME of
637 length LEN. Rather than having to know the names used by all of
638 our front ends, we strip off an ending of a period followed by
639 up to five characters. (Java uses ".class".) */
642 strip_off_ending (char *name, int len)
645 for (i = 2; i < 6 && len > i; i++)
647 if (name[len - i] == '.')
649 name[len - i] = '\0';
655 /* Output a quoted string. */
658 output_quoted_string (FILE *asm_file, const char *string)
660 #ifdef OUTPUT_QUOTED_STRING
661 OUTPUT_QUOTED_STRING (asm_file, string);
665 putc ('\"', asm_file);
666 while ((c = *string++) != 0)
670 if (c == '\"' || c == '\\')
671 putc ('\\', asm_file);
675 fprintf (asm_file, "\\%03o", (unsigned char) c);
677 putc ('\"', asm_file);
681 /* Output a file name in the form wanted by System V. */
684 output_file_directive (FILE *asm_file, const char *input_name)
689 if (input_name == NULL)
690 input_name = "<stdin>";
692 len = strlen (input_name);
693 na = input_name + len;
695 /* NA gets INPUT_NAME sans directory names. */
696 while (na > input_name)
698 if (IS_DIR_SEPARATOR (na[-1]))
703 #ifdef ASM_OUTPUT_SOURCE_FILENAME
704 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
706 fprintf (asm_file, "\t.file\t");
707 output_quoted_string (asm_file, na);
708 fputc ('\n', asm_file);
712 /* Do any final processing required for the declarations in VEC, of
713 which there are LEN. We write out inline functions and variables
714 that have been deferred until this point, but which are required.
715 Returns nonzero if anything was put out. */
718 wrapup_global_declarations (tree *vec, int len)
723 int output_something = 0;
725 for (i = 0; i < len; i++)
729 /* We're not deferring this any longer. Assignment is
730 conditional to avoid needlessly dirtying PCH pages. */
731 if (DECL_DEFER_OUTPUT (decl) != 0)
732 DECL_DEFER_OUTPUT (decl) = 0;
734 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
735 lang_hooks.finish_incomplete_decl (decl);
738 /* Now emit any global variables or functions that we have been
739 putting off. We need to loop in case one of the things emitted
740 here references another one which comes earlier in the list. */
744 for (i = 0; i < len; i++)
748 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
751 /* Don't write out static consts, unless we still need them.
753 We also keep static consts if not optimizing (for debugging),
754 unless the user specified -fno-keep-static-consts.
755 ??? They might be better written into the debug information.
756 This is possible when using DWARF.
758 A language processor that wants static constants to be always
759 written out (even if it is not used) is responsible for
760 calling rest_of_decl_compilation itself. E.g. the C front-end
761 calls rest_of_decl_compilation from finish_decl.
762 One motivation for this is that is conventional in some
763 environments to write things like:
764 static const char rcsid[] = "... version string ...";
765 intending to force the string to be in the executable.
767 A language processor that would prefer to have unneeded
768 static constants "optimized away" would just defer writing
769 them out until here. E.g. C++ does this, because static
770 constants are often defined in header files.
772 ??? A tempting alternative (for both C and C++) would be
773 to force a constant to be written if and only if it is
774 defined in a main file, as opposed to an include file. */
776 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
778 struct cgraph_varpool_node *node;
780 node = cgraph_varpool_node (decl);
782 if (flag_unit_at_a_time && node->finalized)
784 else if (node->alias)
786 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
788 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
790 else if (node->needed)
792 else if (DECL_COMDAT (decl))
794 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
795 && (optimize || !flag_keep_static_consts
796 || DECL_ARTIFICIAL (decl)))
802 rest_of_decl_compilation (decl, 1, 1);
808 output_something = 1;
812 return output_something;
815 /* Issue appropriate warnings for the global declarations in VEC (of
816 which there are LEN). Output debugging information for them. */
819 check_global_declarations (tree *vec, int len)
824 for (i = 0; i < len; i++)
828 /* Do not emit debug information about variables that are in
829 static storage, but not defined. */
830 if (TREE_CODE (decl) == VAR_DECL
831 && TREE_STATIC (decl)
832 && !TREE_ASM_WRITTEN (decl))
833 DECL_IGNORED_P (decl) = 1;
835 /* Warn about any function
836 declared static but not defined.
837 We don't warn about variables,
838 because many programs have static variables
839 that exist only to get some text into the object file. */
840 if (TREE_CODE (decl) == FUNCTION_DECL
841 && DECL_INITIAL (decl) == 0
842 && DECL_EXTERNAL (decl)
843 && ! DECL_ARTIFICIAL (decl)
844 && ! TREE_NO_WARNING (decl)
845 && ! TREE_PUBLIC (decl)
846 && (warn_unused_function
847 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
849 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
850 pedwarn ("%J%qF used but never defined", decl, decl);
852 warning ("%J%qF declared %<static%> but never defined",
854 /* This symbol is effectively an "extern" declaration now. */
855 TREE_PUBLIC (decl) = 1;
856 assemble_external (decl);
859 /* Warn about static fns or vars defined but not used. */
860 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
861 /* We don't warn about "static const" variables because the
862 "rcs_id" idiom uses that construction. */
863 || (warn_unused_variable
864 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
865 && ! DECL_IN_SYSTEM_HEADER (decl)
866 && ! TREE_USED (decl)
867 /* The TREE_USED bit for file-scope decls is kept in the identifier,
868 to handle multiple external decls in different scopes. */
869 && ! TREE_USED (DECL_NAME (decl))
870 && ! DECL_EXTERNAL (decl)
871 && ! TREE_PUBLIC (decl)
872 /* A volatile variable might be used in some non-obvious way. */
873 && ! TREE_THIS_VOLATILE (decl)
874 /* Global register variables must be declared to reserve them. */
875 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
876 /* Otherwise, ask the language. */
877 && lang_hooks.decls.warn_unused_global (decl))
878 warning ("%J%qD defined but not used", decl, decl);
880 /* Avoid confusing the debug information machinery when there are
882 if (errorcount == 0 && sorrycount == 0)
884 timevar_push (TV_SYMOUT);
885 (*debug_hooks->global_decl) (decl);
886 timevar_pop (TV_SYMOUT);
891 /* Warn about a use of an identifier which was marked deprecated. */
893 warn_deprecated_use (tree node)
895 if (node == 0 || !warn_deprecated_decl)
900 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
901 warning ("%qs is deprecated (declared at %s:%d)",
902 IDENTIFIER_POINTER (DECL_NAME (node)),
903 xloc.file, xloc.line);
905 else if (TYPE_P (node))
907 const char *what = NULL;
908 tree decl = TYPE_STUB_DECL (node);
910 if (TYPE_NAME (node))
912 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
913 what = IDENTIFIER_POINTER (TYPE_NAME (node));
914 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
915 && DECL_NAME (TYPE_NAME (node)))
916 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
921 expanded_location xloc
922 = expand_location (DECL_SOURCE_LOCATION (decl));
924 warning ("%qs is deprecated (declared at %s:%d)", what,
925 xloc.file, xloc.line);
927 warning ("type is deprecated (declared at %s:%d)",
928 xloc.file, xloc.line);
933 warning ("%qs is deprecated", what);
935 warning ("type is deprecated");
940 /* Save the current INPUT_LOCATION on the top entry in the
941 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
942 INPUT_LOCATION accordingly. */
945 #ifdef USE_MAPPED_LOCATION
946 push_srcloc (location_t fline)
948 push_srcloc (const char *file, int line)
951 struct file_stack *fs;
953 fs = xmalloc (sizeof (struct file_stack));
954 fs->location = input_location;
955 fs->next = input_file_stack;
956 #ifdef USE_MAPPED_LOCATION
957 input_location = fline;
959 input_filename = file;
962 input_file_stack = fs;
963 input_file_stack_tick++;
966 /* Pop the top entry off the stack of presently open source files.
967 Restore the INPUT_LOCATION from the new topmost entry on the
973 struct file_stack *fs;
975 fs = input_file_stack;
976 input_location = fs->location;
977 input_file_stack = fs->next;
979 input_file_stack_tick++;
982 /* Compile an entire translation unit. Write a file of assembly
983 output and various debugging dumps. */
988 /* Initialize yet another pass. */
991 init_final (main_input_filename);
992 coverage_init (aux_base_name);
994 timevar_push (TV_PARSE);
996 /* Call the parser, which parses the entire file (calling
997 rest_of_compilation for each function). */
998 lang_hooks.parse_file (set_yydebug);
1000 /* In case there were missing block closers,
1001 get us back to the global binding level. */
1002 lang_hooks.clear_binding_stack ();
1004 /* Compilation is now finished except for writing
1005 what's left of the symbol table output. */
1006 timevar_pop (TV_PARSE);
1008 if (flag_syntax_only)
1011 lang_hooks.decls.final_write_globals ();
1012 cgraph_varpool_assemble_pending_decls ();
1013 finish_aliases_2 ();
1015 /* This must occur after the loop to output deferred functions.
1016 Else the coverage initializer would not be emitted if all the
1017 functions in this compilation unit were deferred. */
1020 /* Likewise for mudflap static object registrations. */
1022 mudflap_finish_file ();
1024 /* Write out any pending weak symbol declarations. */
1028 /* Do dbx symbols. */
1029 timevar_push (TV_SYMOUT);
1031 #ifdef DWARF2_UNWIND_INFO
1032 if (dwarf2out_do_frame ())
1033 dwarf2out_frame_finish ();
1036 (*debug_hooks->finish) (main_input_filename);
1037 timevar_pop (TV_SYMOUT);
1039 /* Output some stuff at end of file if nec. */
1041 dw2_output_indirect_constants ();
1043 /* Flush any pending external directives. cgraph did this for
1044 assemble_external calls from the front end, but the RTL
1045 expander can also generate them. */
1046 process_pending_assemble_externals ();
1048 /* Attach a special .ident directive to the end of the file to identify
1049 the version of GCC which compiled this code. The format of the .ident
1050 string is patterned after the ones produced by native SVR4 compilers. */
1053 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1054 IDENT_ASM_OP, version_string);
1057 /* This must be at the end. Some target ports emit end of file directives
1058 into the assembly file here, and hence we can not output anything to the
1059 assembly file after this point. */
1060 targetm.asm_out.file_end ();
1063 /* Display help for target options. */
1065 display_target_options (void)
1068 static bool displayed = false;
1070 /* Avoid double printing for --help --target-help. */
1076 if (ARRAY_SIZE (target_switches) > 1
1077 #ifdef TARGET_OPTIONS
1078 || ARRAY_SIZE (target_options) > 1
1086 printf (_("\nTarget specific options:\n"));
1088 for (i = ARRAY_SIZE (target_switches); i--;)
1090 const char *option = target_switches[i].name;
1091 const char *description = target_switches[i].description;
1093 if (option == NULL || *option == 0)
1095 else if (description == NULL)
1100 printf (_(" -m%-23s [undocumented]\n"), option);
1102 else if (*description != 0)
1103 doc += printf (" -m%-23s %s\n", option, _(description));
1106 #ifdef TARGET_OPTIONS
1107 for (i = ARRAY_SIZE (target_options); i--;)
1109 const char *option = target_options[i].prefix;
1110 const char *description = target_options[i].description;
1112 if (option == NULL || *option == 0)
1114 else if (description == NULL)
1119 printf (_(" -m%-23s [undocumented]\n"), option);
1121 else if (*description != 0)
1122 doc += printf (" -m%-23s %s\n", option, _(description));
1128 printf (_("\nThere are undocumented target specific options as well.\n"));
1130 printf (_(" They exist, but they are not documented.\n"));
1135 /* Parse a -d... command line switch. */
1138 decode_d_option (const char *arg)
1149 flag_print_asm_name = 1;
1152 flag_dump_rtl_in_asm = 1;
1153 flag_print_asm_name = 1;
1156 graph_dump_format = vcg;
1159 rtl_dump_and_exit = 1;
1164 case 'D': /* These are handled by the preprocessor. */
1168 setup_core_dumping();
1173 if (!enable_rtl_dump_file (c))
1174 warning ("unrecognized gcc debugging option: %c", c);
1179 /* Indexed by enum debug_info_type. */
1180 const char *const debug_type_names[] =
1182 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1185 /* Decode -m switches. */
1186 /* Decode the switch -mNAME. */
1189 set_target_switch (const char *name)
1192 int valid_target_option = 0;
1194 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1195 if (!strcmp (target_switches[j].name, name))
1197 if (target_switches[j].value < 0)
1198 target_flags &= ~-target_switches[j].value;
1200 target_flags |= target_switches[j].value;
1203 if (target_switches[j].value < 0)
1204 target_flags_explicit |= -target_switches[j].value;
1206 target_flags_explicit |= target_switches[j].value;
1208 valid_target_option = 1;
1211 #ifdef TARGET_OPTIONS
1212 if (!valid_target_option)
1213 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1215 int len = strlen (target_options[j].prefix);
1216 if (target_options[j].value)
1218 if (!strcmp (target_options[j].prefix, name))
1220 *target_options[j].variable = target_options[j].value;
1221 valid_target_option = 1;
1226 if (!strncmp (target_options[j].prefix, name, len))
1228 *target_options[j].variable = name + len;
1229 valid_target_option = 1;
1235 if (!valid_target_option)
1236 error ("invalid option %qs", name);
1239 /* Print version information to FILE.
1240 Each line begins with INDENT (for the case where FILE is the
1241 assembler output file). */
1244 print_version (FILE *file, const char *indent)
1247 #define __VERSION__ "[?]"
1251 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1253 "%s%s%s version %s (%s) compiled by CC.\n"
1255 , indent, *indent != 0 ? " " : "",
1256 lang_hooks.name, version_string, TARGET_NAME,
1257 indent, __VERSION__);
1258 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1259 indent, *indent != 0 ? " " : "",
1260 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1263 /* Print an option value and return the adjusted position in the line.
1264 ??? We don't handle error returns from fprintf (disk full); presumably
1265 other code will catch a disk full though. */
1268 print_single_switch (FILE *file, int pos, int max,
1269 const char *indent, const char *sep, const char *term,
1270 const char *type, const char *name)
1272 /* The ultrix fprintf returns 0 on success, so compute the result we want
1273 here since we need it for the following test. */
1274 int len = strlen (sep) + strlen (type) + strlen (name);
1279 fprintf (file, "%s", term);
1284 fprintf (file, "%s", indent);
1285 pos = strlen (indent);
1287 fprintf (file, "%s%s%s", sep, type, name);
1292 /* Print active target switches to FILE.
1293 POS is the current cursor position and MAX is the size of a "line".
1294 Each line begins with INDENT and ends with TERM.
1295 Each switch is separated from the next by SEP. */
1298 print_switch_values (FILE *file, int pos, int max,
1299 const char *indent, const char *sep, const char *term)
1304 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1305 that it can be printed below. This helps reproducibility. */
1308 /* Print the options as passed. */
1309 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1310 _("options passed: "), "");
1312 for (p = &save_argv[1]; *p != NULL; p++)
1316 if (strcmp (*p, "-o") == 0)
1322 if (strcmp (*p, "-quiet") == 0)
1324 if (strcmp (*p, "-version") == 0)
1329 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1332 fprintf (file, "%s", term);
1334 /* Print the -f and -m options that have been enabled.
1335 We don't handle language specific options but printing argv
1338 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1339 _("options enabled: "), "");
1341 for (j = 0; j < cl_options_count; j++)
1343 if (!cl_options[j].flag_var
1344 || !(cl_options[j].flags & CL_REPORT))
1347 if (cl_options[j].has_set_value)
1349 if (*cl_options[j].flag_var != cl_options[j].set_value)
1354 if (!*cl_options[j].flag_var)
1358 pos = print_single_switch (file, pos, max, indent, sep, term,
1359 "", cl_options[j].opt_text);
1362 /* Print target specific options. */
1364 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1365 if (target_switches[j].name[0] != '\0'
1366 && target_switches[j].value > 0
1367 && ((target_switches[j].value & target_flags)
1368 == target_switches[j].value))
1370 pos = print_single_switch (file, pos, max, indent, sep, term,
1371 "-m", target_switches[j].name);
1374 #ifdef TARGET_OPTIONS
1375 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1376 if (*target_options[j].variable != NULL)
1379 sprintf (prefix, "-m%s", target_options[j].prefix);
1380 pos = print_single_switch (file, pos, max, indent, sep, term,
1381 prefix, *target_options[j].variable);
1385 fprintf (file, "%s", term);
1388 /* Open assembly code output file. Do this even if -fsyntax-only is
1389 on, because then the driver will have provided the name of a
1390 temporary file or bit bucket for us. NAME is the file specified on
1391 the command line, possibly NULL. */
1393 init_asm_output (const char *name)
1395 if (name == NULL && asm_file_name == 0)
1396 asm_out_file = stdout;
1399 if (asm_file_name == 0)
1401 int len = strlen (dump_base_name);
1402 char *dumpname = xmalloc (len + 6);
1403 memcpy (dumpname, dump_base_name, len + 1);
1404 strip_off_ending (dumpname, len);
1405 strcat (dumpname, ".s");
1406 asm_file_name = dumpname;
1408 if (!strcmp (asm_file_name, "-"))
1409 asm_out_file = stdout;
1411 asm_out_file = fopen (asm_file_name, "w+b");
1412 if (asm_out_file == 0)
1413 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1416 if (!flag_syntax_only)
1418 targetm.asm_out.file_start ();
1420 #ifdef ASM_COMMENT_START
1421 if (flag_verbose_asm)
1423 /* Print the list of options in effect. */
1424 print_version (asm_out_file, ASM_COMMENT_START);
1425 print_switch_values (asm_out_file, 0, MAX_LINE,
1426 ASM_COMMENT_START, " ", "\n");
1427 /* Add a blank line here so it appears in assembler output but not
1429 fprintf (asm_out_file, "\n");
1435 /* Default version of get_pch_validity.
1436 By default, every flag difference is fatal; that will be mostly right for
1437 most targets, but completely right for very few. */
1440 default_get_pch_validity (size_t *len)
1442 #ifdef TARGET_OPTIONS
1447 *len = sizeof (target_flags) + 2;
1448 #ifdef TARGET_OPTIONS
1449 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1452 if (*target_options[i].variable)
1453 *len += strlen (*target_options[i].variable);
1457 result = r = xmalloc (*len);
1461 memcpy (r, &target_flags, sizeof (target_flags));
1462 r += sizeof (target_flags);
1464 #ifdef TARGET_OPTIONS
1465 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1467 const char *str = *target_options[i].variable;
1471 l = strlen (str) + 1;
1480 /* Default version of pch_valid_p. */
1483 default_pch_valid_p (const void *data_p, size_t len)
1485 const char *data = (const char *)data_p;
1486 const char *flag_that_differs = NULL;
1489 /* -fpic and -fpie also usually make a PCH invalid. */
1490 if (data[0] != flag_pic)
1491 return _("created and used with different settings of -fpic");
1492 if (data[1] != flag_pie)
1493 return _("created and used with different settings of -fpie");
1496 /* Check target_flags. */
1497 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
1499 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
1504 memcpy (&tf, data, sizeof (target_flags));
1506 bits = target_switches[i].value;
1509 if ((target_flags & bits) != (tf & bits))
1511 flag_that_differs = target_switches[i].name;
1517 data += sizeof (target_flags);
1518 len -= sizeof (target_flags);
1520 /* Check string options. */
1521 #ifdef TARGET_OPTIONS
1522 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1524 const char *str = *target_options[i].variable;
1528 l = strlen (str) + 1;
1529 if (len < l || memcmp (data, str, l) != 0)
1531 flag_that_differs = target_options[i].prefix;
1544 asprintf (&r, _("created and used with differing settings of '-m%s'"),
1547 return _("out of memory");
1552 /* Default tree printer. Handles declarations only. */
1554 default_tree_printer (pretty_printer * pp, text_info *text)
1558 switch (*text->format_spec)
1561 t = va_arg (*text->args_ptr, tree);
1562 if (DECL_DEBUG_EXPR (t) && DECL_DEBUG_EXPR_IS_FROM (t))
1563 t = DECL_DEBUG_EXPR (t);
1568 t = va_arg (*text->args_ptr, tree);
1577 const char *n = DECL_NAME (t)
1578 ? lang_hooks.decl_printable_name (t, 2)
1583 dump_generic_node (pp, t, 0, 0, 0);
1588 /* Initialization of the front end environment, before command line
1589 options are parsed. Signal handlers, internationalization etc.
1590 ARGV0 is main's argv[0]. */
1592 general_init (const char *argv0)
1596 p = argv0 + strlen (argv0);
1597 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1601 xmalloc_set_program_name (progname);
1605 /* Unlock the stdio streams. */
1606 unlock_std_streams ();
1608 gcc_init_libintl ();
1610 /* Initialize the diagnostics reporting machinery, so option parsing
1611 can give warnings and errors. */
1612 diagnostic_initialize (global_dc);
1613 /* Set a default printer. Language specific initializations will
1614 override it later. */
1615 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1617 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1619 signal (SIGSEGV, crash_signal);
1622 signal (SIGILL, crash_signal);
1625 signal (SIGBUS, crash_signal);
1628 signal (SIGABRT, crash_signal);
1630 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1631 signal (SIGIOT, crash_signal);
1634 signal (SIGFPE, crash_signal);
1637 /* Other host-specific signal setup. */
1638 (*host_hooks.extra_signals)();
1640 /* Initialize the garbage-collector, string pools and tree type hash
1644 linemap_init (&line_table);
1647 /* Initialize register usage now so switches may override. */
1650 /* Register the language-independent parameters. */
1651 add_params (lang_independent_params, LAST_PARAM);
1653 /* This must be done after add_params but before argument processing. */
1654 init_ggc_heuristics();
1655 init_tree_optimization_passes ();
1658 /* Process the options that have been parsed. */
1660 process_options (void)
1662 /* Allow the front end to perform consistency checks and do further
1663 initialization based on the command line options. This hook also
1664 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1665 so we can correctly initialize debug output. */
1666 no_backend = lang_hooks.post_options (&main_input_filename);
1667 #ifndef USE_MAPPED_LOCATION
1668 input_filename = main_input_filename;
1671 #ifdef OVERRIDE_OPTIONS
1672 /* Some machines may reject certain combinations of options. */
1676 if (flag_short_enums == 2)
1677 flag_short_enums = targetm.default_short_enums ();
1679 /* Set aux_base_name if not already set. */
1682 else if (main_input_filename)
1684 char *name = xstrdup (lbasename (main_input_filename));
1686 strip_off_ending (name, strlen (name));
1687 aux_base_name = name;
1690 aux_base_name = "gccaux";
1692 /* Set up the align_*_log variables, defaulting them to 1 if they
1693 were still unset. */
1694 if (align_loops <= 0) align_loops = 1;
1695 if (align_loops_max_skip > align_loops || !align_loops)
1696 align_loops_max_skip = align_loops - 1;
1697 align_loops_log = floor_log2 (align_loops * 2 - 1);
1698 if (align_jumps <= 0) align_jumps = 1;
1699 if (align_jumps_max_skip > align_jumps || !align_jumps)
1700 align_jumps_max_skip = align_jumps - 1;
1701 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1702 if (align_labels <= 0) align_labels = 1;
1703 align_labels_log = floor_log2 (align_labels * 2 - 1);
1704 if (align_labels_max_skip > align_labels || !align_labels)
1705 align_labels_max_skip = align_labels - 1;
1706 if (align_functions <= 0) align_functions = 1;
1707 align_functions_log = floor_log2 (align_functions * 2 - 1);
1709 /* Unrolling all loops implies that standard loop unrolling must also
1711 if (flag_unroll_all_loops)
1712 flag_unroll_loops = 1;
1714 /* The loop unrolling code assumes that cse will be run after loop. */
1715 if (flag_unroll_loops || flag_peel_loops)
1716 flag_rerun_cse_after_loop = 1;
1718 /* If explicitly asked to run new loop optimizer, switch off the old
1720 if (flag_loop_optimize2)
1721 flag_loop_optimize = 0;
1723 /* Enable new loop optimizer pass if any of its optimizations is called. */
1724 if (flag_move_loop_invariants
1725 || flag_unswitch_loops
1727 || flag_unroll_loops
1728 || flag_branch_on_count_reg)
1729 flag_loop_optimize2 = 1;
1731 if (flag_non_call_exceptions)
1732 flag_asynchronous_unwind_tables = 1;
1733 if (flag_asynchronous_unwind_tables)
1734 flag_unwind_tables = 1;
1736 /* Disable unit-at-a-time mode for frontends not supporting callgraph
1738 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
1739 flag_unit_at_a_time = 0;
1741 if (flag_value_profile_transformations)
1742 flag_profile_values = 1;
1744 /* Speculative prefetching implies the value profiling. We also switch off
1745 the prefetching in the loop optimizer, so that we do not emit double
1746 prefetches. TODO -- we should teach these two to cooperate; the loop
1747 based prefetching may sometimes do a better job, especially in connection
1748 with reuse analysis. */
1749 if (flag_speculative_prefetching)
1751 flag_profile_values = 1;
1752 flag_prefetch_loop_arrays = 0;
1755 /* Warn about options that are not supported on this machine. */
1756 #ifndef INSN_SCHEDULING
1757 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1758 warning ("instruction scheduling not supported on this target machine");
1761 if (flag_delayed_branch)
1762 warning ("this target machine does not have delayed branches");
1765 if (flag_tree_based_profiling && flag_profile_values)
1766 sorry ("value-based profiling not yet implemented in trees.");
1768 user_label_prefix = USER_LABEL_PREFIX;
1769 if (flag_leading_underscore != -1)
1771 /* If the default prefix is more complicated than "" or "_",
1772 issue a warning and ignore this option. */
1773 if (user_label_prefix[0] == 0 ||
1774 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1776 user_label_prefix = flag_leading_underscore ? "_" : "";
1779 warning ("-f%sleading-underscore not supported on this target machine",
1780 flag_leading_underscore ? "" : "no-");
1783 /* If we are in verbose mode, write out the version and maybe all the
1784 option flags in use. */
1787 print_version (stderr, "");
1789 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
1792 if (flag_syntax_only)
1794 write_symbols = NO_DEBUG;
1798 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1800 if (debug_info_level == DINFO_LEVEL_NONE)
1801 write_symbols = NO_DEBUG;
1803 /* Now we know write_symbols, set up the debug hooks based on it.
1804 By default we do nothing for debug output. */
1805 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1806 default_debug_hooks = &do_nothing_debug_hooks;
1807 #if defined(DBX_DEBUGGING_INFO)
1808 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1809 default_debug_hooks = &dbx_debug_hooks;
1811 #if defined(XCOFF_DEBUGGING_INFO)
1812 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1813 default_debug_hooks = &xcoff_debug_hooks;
1815 #ifdef SDB_DEBUGGING_INFO
1816 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1817 default_debug_hooks = &sdb_debug_hooks;
1819 #ifdef DWARF2_DEBUGGING_INFO
1820 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1821 default_debug_hooks = &dwarf2_debug_hooks;
1823 #ifdef VMS_DEBUGGING_INFO
1824 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1825 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1826 default_debug_hooks = &vmsdbg_debug_hooks;
1829 debug_hooks = &do_nothing_debug_hooks;
1830 if (write_symbols == NO_DEBUG)
1832 #if defined(DBX_DEBUGGING_INFO)
1833 else if (write_symbols == DBX_DEBUG)
1834 debug_hooks = &dbx_debug_hooks;
1836 #if defined(XCOFF_DEBUGGING_INFO)
1837 else if (write_symbols == XCOFF_DEBUG)
1838 debug_hooks = &xcoff_debug_hooks;
1840 #ifdef SDB_DEBUGGING_INFO
1841 else if (write_symbols == SDB_DEBUG)
1842 debug_hooks = &sdb_debug_hooks;
1844 #ifdef DWARF2_DEBUGGING_INFO
1845 else if (write_symbols == DWARF2_DEBUG)
1846 debug_hooks = &dwarf2_debug_hooks;
1848 #ifdef VMS_DEBUGGING_INFO
1849 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1850 debug_hooks = &vmsdbg_debug_hooks;
1853 error ("target system does not support the \"%s\" debug format",
1854 debug_type_names[write_symbols]);
1856 /* Now we know which debug output will be used so we can set
1857 flag_var_tracking, flag_rename_registers if the user has
1858 not specified them. */
1859 if (debug_info_level < DINFO_LEVEL_NORMAL
1860 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1862 if (flag_var_tracking == 1)
1864 if (debug_info_level < DINFO_LEVEL_NORMAL)
1865 warning ("variable tracking requested, but useless unless "
1866 "producing debug info");
1868 warning ("variable tracking requested, but not supported "
1869 "by this debug format");
1871 flag_var_tracking = 0;
1874 if (flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING)
1875 flag_rename_registers = default_debug_hooks->var_location
1876 != do_nothing_debug_hooks.var_location;
1878 if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING)
1879 flag_var_tracking = optimize >= 1;
1881 /* If auxiliary info generation is desired, open the output file.
1882 This goes in the same directory as the source file--unlike
1883 all the other output files. */
1884 if (flag_gen_aux_info)
1886 aux_info_file = fopen (aux_info_file_name, "w");
1887 if (aux_info_file == 0)
1888 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1891 if (! targetm.have_named_sections)
1893 if (flag_function_sections)
1895 warning ("-ffunction-sections not supported for this target");
1896 flag_function_sections = 0;
1898 if (flag_data_sections)
1900 warning ("-fdata-sections not supported for this target");
1901 flag_data_sections = 0;
1905 if (flag_function_sections && profile_flag)
1907 warning ("-ffunction-sections disabled; it makes profiling impossible");
1908 flag_function_sections = 0;
1911 #ifndef HAVE_prefetch
1912 if (flag_prefetch_loop_arrays)
1914 warning ("-fprefetch-loop-arrays not supported for this target");
1915 flag_prefetch_loop_arrays = 0;
1917 if (flag_speculative_prefetching)
1919 if (flag_speculative_prefetching_set)
1920 warning ("-fspeculative-prefetching not supported for this target");
1921 flag_speculative_prefetching = 0;
1924 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1926 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
1927 flag_prefetch_loop_arrays = 0;
1929 if (flag_speculative_prefetching && !HAVE_prefetch)
1931 if (flag_speculative_prefetching_set)
1932 warning ("-fspeculative-prefetching not supported for this target (try -march switches)");
1933 flag_speculative_prefetching = 0;
1937 /* This combination of options isn't handled for i386 targets and doesn't
1938 make much sense anyway, so don't allow it. */
1939 if (flag_prefetch_loop_arrays && optimize_size)
1941 warning ("-fprefetch-loop-arrays is not supported with -Os");
1942 flag_prefetch_loop_arrays = 0;
1945 #ifndef OBJECT_FORMAT_ELF
1946 if (flag_function_sections && write_symbols != NO_DEBUG)
1947 warning ("-ffunction-sections may affect debugging on some targets");
1950 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1951 if (flag_signaling_nans)
1952 flag_trapping_math = 1;
1954 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1955 if (flag_cx_limited_range)
1956 flag_complex_method = 0;
1959 /* Initialize the compiler back end. */
1963 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
1964 || debug_info_level == DINFO_LEVEL_VERBOSE
1965 #ifdef VMS_DEBUGGING_INFO
1966 /* Enable line number info for traceback. */
1967 || debug_info_level > DINFO_LEVEL_NONE
1969 || flag_test_coverage);
1973 init_fake_stack_mems ();
1977 init_function_once ();
1978 init_varasm_once ();
1980 /* The following initialization functions need to generate rtl, so
1981 provide a dummy function context for them. */
1982 init_dummy_function_start ();
1984 if (flag_caller_saves)
1985 init_caller_save ();
1986 expand_dummy_function_end ();
1989 /* Language-dependent initialization. Returns nonzero on success. */
1991 lang_dependent_init (const char *name)
1993 location_t save_loc = input_location;
1994 if (dump_base_name == 0)
1995 dump_base_name = name && name[0] ? name : "gccdump";
1997 /* Other front-end initialization. */
1998 #ifdef USE_MAPPED_LOCATION
1999 input_location = BUILTINS_LOCATION;
2001 input_filename = "<built-in>";
2004 if (lang_hooks.init () == 0)
2006 input_location = save_loc;
2008 init_asm_output (name);
2010 /* These create various _DECL nodes, so need to be called after the
2011 front end is initialized. */
2015 /* The following initialization functions need to generate rtl, so
2016 provide a dummy function context for them. */
2017 init_dummy_function_start ();
2019 expand_dummy_function_end ();
2021 /* If dbx symbol table desired, initialize writing it and output the
2022 predefined types. */
2023 timevar_push (TV_SYMOUT);
2025 #ifdef DWARF2_UNWIND_INFO
2026 if (dwarf2out_do_frame ())
2027 dwarf2out_frame_init ();
2030 /* Now we have the correct original filename, we can initialize
2032 (*debug_hooks->init) (name);
2034 timevar_pop (TV_SYMOUT);
2039 /* Clean up: close opened files, etc. */
2044 /* Close the dump files. */
2045 if (flag_gen_aux_info)
2047 fclose (aux_info_file);
2049 unlink (aux_info_file_name);
2052 /* Close non-debugging input and output files. Take special care to note
2053 whether fclose returns an error, since the pages might still be on the
2054 buffer chain while the file is open. */
2058 if (ferror (asm_out_file) != 0)
2059 fatal_error ("error writing to %s: %m", asm_file_name);
2060 if (fclose (asm_out_file) != 0)
2061 fatal_error ("error closing %s: %m", asm_file_name);
2064 finish_optimization_passes ();
2068 ggc_print_statistics ();
2069 stringpool_statistics ();
2070 dump_tree_statistics ();
2071 dump_rtx_statistics ();
2072 dump_varray_statistics ();
2073 dump_alloc_pool_statistics ();
2074 dump_ggc_loc_statistics ();
2077 /* Free up memory for the benefit of leak detectors. */
2080 /* Language-specific end of compilation actions. */
2081 lang_hooks.finish ();
2084 /* Initialize the compiler, and compile the input file. */
2088 /* Initialize timing first. The C front ends read the main file in
2089 the post_options hook, and C++ does file timings. */
2090 if (time_report || !quiet_flag || flag_detailed_statistics)
2092 timevar_start (TV_TOTAL);
2096 /* Don't do any more if an error has already occurred. */
2099 /* This must be run always, because it is needed to compute the FP
2100 predefined macros, such as __LDBL_MAX__, for targets using non
2101 default FP formats. */
2102 init_adjust_machine_modes ();
2104 /* Set up the back-end if requested. */
2108 /* Language-dependent initialization. Returns true on success. */
2109 if (lang_dependent_init (main_input_filename))
2115 /* Stop timing and print the times. */
2116 timevar_stop (TV_TOTAL);
2117 timevar_print (stderr);
2120 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2121 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2122 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2124 It is not safe to call this function more than once. */
2127 toplev_main (unsigned int argc, const char **argv)
2131 /* Initialization of GCC's environment, and diagnostics. */
2132 general_init (argv[0]);
2134 /* Parse the options and do minimal processing; basically just
2135 enough to default flags appropriately. */
2136 decode_options (argc, argv);
2140 /* Exit early if we can (e.g. -help). */
2141 if (!exit_after_options)
2144 if (errorcount || sorrycount)
2145 return (FATAL_EXIT_CODE);
2147 return (SUCCESS_EXIT_CODE);