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"
78 #include "hosthooks.h"
82 #include "value-prof.h"
83 #include "alloc-pool.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 divide (not yet implemented). */
272 int flag_complex_divide_method = 0;
274 /* Nonzero means performs web construction pass. When flag_web ==
275 AUTODETECT_FLAG_VAR_TRACKING it will be set according to optimize
276 and default_debug_hooks in process_options (). */
278 int flag_web = AUTODETECT_FLAG_VAR_TRACKING;
280 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
281 not just because the tree inliner turned us off. */
283 int flag_really_no_inline = 2;
285 /* Nonzero means we should be saving declaration info into a .X file. */
287 int flag_gen_aux_info = 0;
289 /* Specified name of aux-info file. */
291 const char *aux_info_file_name;
293 /* Nonzero if we are compiling code for a shared library, zero for
298 /* Set to the default thread-local storage (tls) model to use. */
300 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
302 /* Nonzero means change certain warnings into errors.
303 Usually these are warnings about failure to conform to some standard. */
305 int flag_pedantic_errors = 0;
307 /* -dA causes debug commentary information to be produced in
308 the generated assembly code (to make it more readable). This option
309 is generally only of use to those who actually need to read the
310 generated assembly code (perhaps while debugging the compiler itself).
311 Currently, this switch is only used by dwarfout.c; however, it is intended
312 to be a catchall for printing debug information in the assembler file. */
314 int flag_debug_asm = 0;
316 /* -dP causes the rtl to be emitted as a comment in assembly. */
318 int flag_dump_rtl_in_asm = 0;
320 /* When non-NULL, indicates that whenever space is allocated on the
321 stack, the resulting stack pointer must not pass this
322 address---that is, for stacks that grow downward, the stack pointer
323 must always be greater than or equal to this address; for stacks
324 that grow upward, the stack pointer must be less than this address.
325 At present, the rtx may be either a REG or a SYMBOL_REF, although
326 the support provided depends on the backend. */
329 /* If one, renumber instruction UIDs to reduce the number of
330 unused UIDs if there are a lot of instructions. If greater than
331 one, unconditionally renumber instruction UIDs. */
332 int flag_renumber_insns = 1;
334 /* Nonzero if we should track variables. When
335 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
336 to optimize, debug_info_level and debug_hooks in process_options (). */
337 int flag_var_tracking = AUTODETECT_FLAG_VAR_TRACKING;
339 /* True if the user has tagged the function with the 'section'
342 bool user_defined_section_attribute = false;
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 char *dump_file_name;
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);
598 /* If we crashed while processing an ASM statement, then be a little more
599 graceful. It's most likely the user's fault. */
600 if (this_is_asm_operands)
602 output_operand_lossage ("unrecoverable error");
603 exit (FATAL_EXIT_CODE);
606 internal_error ("%s", strsignal (signo));
609 /* Arrange to dump core on error. (The regular error message is still
610 printed first, except in the case of abort().) */
613 setup_core_dumping (void)
616 signal (SIGABRT, SIG_DFL);
618 #if defined(HAVE_SETRLIMIT)
621 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
622 fatal_error ("getting core file size maximum limit: %m");
623 rlim.rlim_cur = rlim.rlim_max;
624 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
625 fatal_error ("setting core file size limit to maximum: %m");
628 diagnostic_abort_on_error (global_dc);
632 /* Strip off a legitimate source ending from the input string NAME of
633 length LEN. Rather than having to know the names used by all of
634 our front ends, we strip off an ending of a period followed by
635 up to five characters. (Java uses ".class".) */
638 strip_off_ending (char *name, int len)
641 for (i = 2; i < 6 && len > i; i++)
643 if (name[len - i] == '.')
645 name[len - i] = '\0';
651 /* Output a quoted string. */
654 output_quoted_string (FILE *asm_file, const char *string)
656 #ifdef OUTPUT_QUOTED_STRING
657 OUTPUT_QUOTED_STRING (asm_file, string);
661 putc ('\"', asm_file);
662 while ((c = *string++) != 0)
666 if (c == '\"' || c == '\\')
667 putc ('\\', asm_file);
671 fprintf (asm_file, "\\%03o", (unsigned char) c);
673 putc ('\"', asm_file);
677 /* Output a file name in the form wanted by System V. */
680 output_file_directive (FILE *asm_file, const char *input_name)
685 if (input_name == NULL)
686 input_name = "<stdin>";
688 len = strlen (input_name);
689 na = input_name + len;
691 /* NA gets INPUT_NAME sans directory names. */
692 while (na > input_name)
694 if (IS_DIR_SEPARATOR (na[-1]))
699 #ifdef ASM_OUTPUT_SOURCE_FILENAME
700 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
702 fprintf (asm_file, "\t.file\t");
703 output_quoted_string (asm_file, na);
704 fputc ('\n', asm_file);
708 /* Do any final processing required for the declarations in VEC, of
709 which there are LEN. We write out inline functions and variables
710 that have been deferred until this point, but which are required.
711 Returns nonzero if anything was put out. */
714 wrapup_global_declarations (tree *vec, int len)
719 int output_something = 0;
721 for (i = 0; i < len; i++)
725 /* We're not deferring this any longer. Assignment is
726 conditional to avoid needlessly dirtying PCH pages. */
727 if (DECL_DEFER_OUTPUT (decl) != 0)
728 DECL_DEFER_OUTPUT (decl) = 0;
730 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
731 lang_hooks.finish_incomplete_decl (decl);
734 /* Now emit any global variables or functions that we have been
735 putting off. We need to loop in case one of the things emitted
736 here references another one which comes earlier in the list. */
740 for (i = 0; i < len; i++)
744 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
747 /* Don't write out static consts, unless we still need them.
749 We also keep static consts if not optimizing (for debugging),
750 unless the user specified -fno-keep-static-consts.
751 ??? They might be better written into the debug information.
752 This is possible when using DWARF.
754 A language processor that wants static constants to be always
755 written out (even if it is not used) is responsible for
756 calling rest_of_decl_compilation itself. E.g. the C front-end
757 calls rest_of_decl_compilation from finish_decl.
758 One motivation for this is that is conventional in some
759 environments to write things like:
760 static const char rcsid[] = "... version string ...";
761 intending to force the string to be in the executable.
763 A language processor that would prefer to have unneeded
764 static constants "optimized away" would just defer writing
765 them out until here. E.g. C++ does this, because static
766 constants are often defined in header files.
768 ??? A tempting alternative (for both C and C++) would be
769 to force a constant to be written if and only if it is
770 defined in a main file, as opposed to an include file. */
772 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
774 struct cgraph_varpool_node *node;
776 node = cgraph_varpool_node (decl);
778 if (flag_unit_at_a_time && node->finalized)
780 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
782 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
784 else if (node->needed)
786 else if (DECL_COMDAT (decl))
788 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
789 && (optimize || !flag_keep_static_consts
790 || DECL_ARTIFICIAL (decl)))
796 rest_of_decl_compilation (decl, 1, 1);
802 output_something = 1;
806 return output_something;
809 /* Issue appropriate warnings for the global declarations in VEC (of
810 which there are LEN). Output debugging information for them. */
813 check_global_declarations (tree *vec, int len)
818 for (i = 0; i < len; i++)
822 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
823 && ! TREE_ASM_WRITTEN (decl))
824 /* Cancel the RTL for this decl so that, if debugging info
825 output for global variables is still to come,
826 this one will be omitted. */
827 SET_DECL_RTL (decl, NULL_RTX);
829 /* Warn about any function
830 declared static but not defined.
831 We don't warn about variables,
832 because many programs have static variables
833 that exist only to get some text into the object file. */
834 if (TREE_CODE (decl) == FUNCTION_DECL
835 && DECL_INITIAL (decl) == 0
836 && DECL_EXTERNAL (decl)
837 && ! DECL_ARTIFICIAL (decl)
838 && ! TREE_NO_WARNING (decl)
839 && ! TREE_PUBLIC (decl)
840 && (warn_unused_function
841 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
843 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
844 pedwarn ("%J'%F' used but never defined", decl, decl);
846 warning ("%J'%F' declared `static' but never defined", decl, decl);
847 /* This symbol is effectively an "extern" declaration now. */
848 TREE_PUBLIC (decl) = 1;
849 assemble_external (decl);
852 /* Warn about static fns or vars defined but not used. */
853 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
854 /* We don't warn about "static const" variables because the
855 "rcs_id" idiom uses that construction. */
856 || (warn_unused_variable
857 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
858 && ! DECL_IN_SYSTEM_HEADER (decl)
859 && ! TREE_USED (decl)
860 /* The TREE_USED bit for file-scope decls is kept in the identifier,
861 to handle multiple external decls in different scopes. */
862 && ! TREE_USED (DECL_NAME (decl))
863 && ! DECL_EXTERNAL (decl)
864 && ! TREE_PUBLIC (decl)
865 /* A volatile variable might be used in some non-obvious way. */
866 && ! TREE_THIS_VOLATILE (decl)
867 /* Global register variables must be declared to reserve them. */
868 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
869 /* Otherwise, ask the language. */
870 && lang_hooks.decls.warn_unused_global (decl))
871 warning ("%J'%D' defined but not used", decl, decl);
873 /* Avoid confusing the debug information machinery when there are
875 if (errorcount == 0 && sorrycount == 0)
877 timevar_push (TV_SYMOUT);
878 (*debug_hooks->global_decl) (decl);
879 timevar_pop (TV_SYMOUT);
884 /* Warn about a use of an identifier which was marked deprecated. */
886 warn_deprecated_use (tree node)
888 if (node == 0 || !warn_deprecated_decl)
893 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
894 warning ("`%s' is deprecated (declared at %s:%d)",
895 IDENTIFIER_POINTER (DECL_NAME (node)),
896 xloc.file, xloc.line);
898 else if (TYPE_P (node))
900 const char *what = NULL;
901 tree decl = TYPE_STUB_DECL (node);
903 if (TYPE_NAME (node))
905 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
906 what = IDENTIFIER_POINTER (TYPE_NAME (node));
907 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
908 && DECL_NAME (TYPE_NAME (node)))
909 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
914 expanded_location xloc
915 = expand_location (DECL_SOURCE_LOCATION (decl));
917 warning ("`%s' is deprecated (declared at %s:%d)", what,
918 xloc.file, xloc.line);
920 warning ("type is deprecated (declared at %s:%d)",
921 xloc.file, xloc.line);
926 warning ("`%s' is deprecated", what);
928 warning ("type is deprecated");
933 /* Save the current INPUT_LOCATION on the top entry in the
934 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
935 INPUT_LOCATION accordingly. */
938 #ifdef USE_MAPPED_LOCATION
939 push_srcloc (location_t fline)
941 push_srcloc (const char *file, int line)
944 struct file_stack *fs;
946 fs = xmalloc (sizeof (struct file_stack));
947 fs->location = input_location;
948 fs->next = input_file_stack;
949 #ifdef USE_MAPPED_LOCATION
950 input_location = fline;
952 input_filename = file;
955 input_file_stack = fs;
956 input_file_stack_tick++;
959 /* Pop the top entry off the stack of presently open source files.
960 Restore the INPUT_LOCATION from the new topmost entry on the
966 struct file_stack *fs;
968 fs = input_file_stack;
969 input_location = fs->location;
970 input_file_stack = fs->next;
972 input_file_stack_tick++;
975 /* Compile an entire translation unit. Write a file of assembly
976 output and various debugging dumps. */
981 /* Initialize yet another pass. */
984 init_final (main_input_filename);
985 coverage_init (aux_base_name);
987 timevar_push (TV_PARSE);
989 /* Call the parser, which parses the entire file (calling
990 rest_of_compilation for each function). */
991 lang_hooks.parse_file (set_yydebug);
993 /* In case there were missing block closers,
994 get us back to the global binding level. */
995 lang_hooks.clear_binding_stack ();
997 /* Compilation is now finished except for writing
998 what's left of the symbol table output. */
999 timevar_pop (TV_PARSE);
1001 if (flag_syntax_only)
1004 lang_hooks.decls.final_write_globals ();
1006 cgraph_varpool_assemble_pending_decls ();
1008 /* This must occur after the loop to output deferred functions.
1009 Else the coverage initializer would not be emitted if all the
1010 functions in this compilation unit were deferred. */
1013 /* Write out any pending weak symbol declarations. */
1017 /* Do dbx symbols. */
1018 timevar_push (TV_SYMOUT);
1020 #ifdef DWARF2_UNWIND_INFO
1021 if (dwarf2out_do_frame ())
1022 dwarf2out_frame_finish ();
1025 (*debug_hooks->finish) (main_input_filename);
1026 timevar_pop (TV_SYMOUT);
1028 /* Output some stuff at end of file if nec. */
1030 dw2_output_indirect_constants ();
1032 /* Attach a special .ident directive to the end of the file to identify
1033 the version of GCC which compiled this code. The format of the .ident
1034 string is patterned after the ones produced by native SVR4 compilers. */
1037 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1038 IDENT_ASM_OP, version_string);
1041 /* This must be at the end. Some target ports emit end of file directives
1042 into the assembly file here, and hence we can not output anything to the
1043 assembly file after this point. */
1044 targetm.asm_out.file_end ();
1047 /* Display help for target options. */
1049 display_target_options (void)
1052 static bool displayed = false;
1054 /* Avoid double printing for --help --target-help. */
1060 if (ARRAY_SIZE (target_switches) > 1
1061 #ifdef TARGET_OPTIONS
1062 || ARRAY_SIZE (target_options) > 1
1070 printf (_("\nTarget specific options:\n"));
1072 for (i = ARRAY_SIZE (target_switches); i--;)
1074 const char *option = target_switches[i].name;
1075 const char *description = target_switches[i].description;
1077 if (option == NULL || *option == 0)
1079 else if (description == NULL)
1084 printf (_(" -m%-23s [undocumented]\n"), option);
1086 else if (*description != 0)
1087 doc += printf (" -m%-23s %s\n", option, _(description));
1090 #ifdef TARGET_OPTIONS
1091 for (i = ARRAY_SIZE (target_options); i--;)
1093 const char *option = target_options[i].prefix;
1094 const char *description = target_options[i].description;
1096 if (option == NULL || *option == 0)
1098 else if (description == NULL)
1103 printf (_(" -m%-23s [undocumented]\n"), option);
1105 else if (*description != 0)
1106 doc += printf (" -m%-23s %s\n", option, _(description));
1112 printf (_("\nThere are undocumented target specific options as well.\n"));
1114 printf (_(" They exist, but they are not documented.\n"));
1119 /* Parse a -d... command line switch. */
1122 decode_d_option (const char *arg)
1133 flag_print_asm_name = 1;
1136 flag_dump_rtl_in_asm = 1;
1137 flag_print_asm_name = 1;
1140 graph_dump_format = vcg;
1143 rtl_dump_and_exit = 1;
1148 case 'D': /* These are handled by the preprocessor. */
1152 setup_core_dumping();
1157 if (!enable_rtl_dump_file (c))
1158 warning ("unrecognized gcc debugging option: %c", c);
1163 /* Indexed by enum debug_info_type. */
1164 const char *const debug_type_names[] =
1166 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
1169 /* Decode -m switches. */
1170 /* Decode the switch -mNAME. */
1173 set_target_switch (const char *name)
1176 int valid_target_option = 0;
1178 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1179 if (!strcmp (target_switches[j].name, name))
1181 if (target_switches[j].value < 0)
1182 target_flags &= ~-target_switches[j].value;
1184 target_flags |= target_switches[j].value;
1187 if (target_switches[j].value < 0)
1188 target_flags_explicit |= -target_switches[j].value;
1190 target_flags_explicit |= target_switches[j].value;
1192 valid_target_option = 1;
1195 #ifdef TARGET_OPTIONS
1196 if (!valid_target_option)
1197 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1199 int len = strlen (target_options[j].prefix);
1200 if (target_options[j].value)
1202 if (!strcmp (target_options[j].prefix, name))
1204 *target_options[j].variable = target_options[j].value;
1205 valid_target_option = 1;
1210 if (!strncmp (target_options[j].prefix, name, len))
1212 *target_options[j].variable = name + len;
1213 valid_target_option = 1;
1219 if (!valid_target_option)
1220 error ("invalid option `%s'", name);
1223 /* Print version information to FILE.
1224 Each line begins with INDENT (for the case where FILE is the
1225 assembler output file). */
1228 print_version (FILE *file, const char *indent)
1231 #define __VERSION__ "[?]"
1235 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1237 "%s%s%s version %s (%s) compiled by CC.\n"
1239 , indent, *indent != 0 ? " " : "",
1240 lang_hooks.name, version_string, TARGET_NAME,
1241 indent, __VERSION__);
1242 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1243 indent, *indent != 0 ? " " : "",
1244 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1247 /* Print an option value and return the adjusted position in the line.
1248 ??? We don't handle error returns from fprintf (disk full); presumably
1249 other code will catch a disk full though. */
1252 print_single_switch (FILE *file, int pos, int max,
1253 const char *indent, const char *sep, const char *term,
1254 const char *type, const char *name)
1256 /* The ultrix fprintf returns 0 on success, so compute the result we want
1257 here since we need it for the following test. */
1258 int len = strlen (sep) + strlen (type) + strlen (name);
1263 fprintf (file, "%s", term);
1268 fprintf (file, "%s", indent);
1269 pos = strlen (indent);
1271 fprintf (file, "%s%s%s", sep, type, name);
1276 /* Print active target switches to FILE.
1277 POS is the current cursor position and MAX is the size of a "line".
1278 Each line begins with INDENT and ends with TERM.
1279 Each switch is separated from the next by SEP. */
1282 print_switch_values (FILE *file, int pos, int max,
1283 const char *indent, const char *sep, const char *term)
1288 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1289 that it can be printed below. This helps reproducibility. */
1292 /* Print the options as passed. */
1293 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1294 _("options passed: "), "");
1296 for (p = &save_argv[1]; *p != NULL; p++)
1300 if (strcmp (*p, "-o") == 0)
1306 if (strcmp (*p, "-quiet") == 0)
1308 if (strcmp (*p, "-version") == 0)
1313 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1316 fprintf (file, "%s", term);
1318 /* Print the -f and -m options that have been enabled.
1319 We don't handle language specific options but printing argv
1322 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1323 _("options enabled: "), "");
1325 for (j = 0; j < cl_options_count; j++)
1327 if (!cl_options[j].flag_var
1328 || !(cl_options[j].flags & CL_REPORT))
1331 if (cl_options[j].has_set_value)
1333 if (*cl_options[j].flag_var != cl_options[j].set_value)
1338 if (!*cl_options[j].flag_var)
1342 pos = print_single_switch (file, pos, max, indent, sep, term,
1343 "", cl_options[j].opt_text);
1346 /* Print target specific options. */
1348 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1349 if (target_switches[j].name[0] != '\0'
1350 && target_switches[j].value > 0
1351 && ((target_switches[j].value & target_flags)
1352 == target_switches[j].value))
1354 pos = print_single_switch (file, pos, max, indent, sep, term,
1355 "-m", target_switches[j].name);
1358 #ifdef TARGET_OPTIONS
1359 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1360 if (*target_options[j].variable != NULL)
1363 sprintf (prefix, "-m%s", target_options[j].prefix);
1364 pos = print_single_switch (file, pos, max, indent, sep, term,
1365 prefix, *target_options[j].variable);
1369 fprintf (file, "%s", term);
1372 /* Open assembly code output file. Do this even if -fsyntax-only is
1373 on, because then the driver will have provided the name of a
1374 temporary file or bit bucket for us. NAME is the file specified on
1375 the command line, possibly NULL. */
1377 init_asm_output (const char *name)
1379 if (name == NULL && asm_file_name == 0)
1380 asm_out_file = stdout;
1383 if (asm_file_name == 0)
1385 int len = strlen (dump_base_name);
1386 char *dumpname = xmalloc (len + 6);
1387 memcpy (dumpname, dump_base_name, len + 1);
1388 strip_off_ending (dumpname, len);
1389 strcat (dumpname, ".s");
1390 asm_file_name = dumpname;
1392 if (!strcmp (asm_file_name, "-"))
1393 asm_out_file = stdout;
1395 asm_out_file = fopen (asm_file_name, "w+b");
1396 if (asm_out_file == 0)
1397 fatal_error ("can't open %s for writing: %m", asm_file_name);
1400 #ifdef IO_BUFFER_SIZE
1401 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
1402 _IOFBF, IO_BUFFER_SIZE);
1405 if (!flag_syntax_only)
1407 targetm.asm_out.file_start ();
1409 #ifdef ASM_COMMENT_START
1410 if (flag_verbose_asm)
1412 /* Print the list of options in effect. */
1413 print_version (asm_out_file, ASM_COMMENT_START);
1414 print_switch_values (asm_out_file, 0, MAX_LINE,
1415 ASM_COMMENT_START, " ", "\n");
1416 /* Add a blank line here so it appears in assembler output but not
1418 fprintf (asm_out_file, "\n");
1424 /* Default version of get_pch_validity.
1425 By default, every flag difference is fatal; that will be mostly right for
1426 most targets, but completely right for very few. */
1429 default_get_pch_validity (size_t *len)
1431 #ifdef TARGET_OPTIONS
1436 *len = sizeof (target_flags) + 2;
1437 #ifdef TARGET_OPTIONS
1438 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1441 if (*target_options[i].variable)
1442 *len += strlen (*target_options[i].variable);
1446 result = r = xmalloc (*len);
1450 memcpy (r, &target_flags, sizeof (target_flags));
1451 r += sizeof (target_flags);
1453 #ifdef TARGET_OPTIONS
1454 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1456 const char *str = *target_options[i].variable;
1460 l = strlen (str) + 1;
1469 /* Default version of pch_valid_p. */
1472 default_pch_valid_p (const void *data_p, size_t len)
1474 const char *data = (const char *)data_p;
1475 const char *flag_that_differs = NULL;
1478 /* -fpic and -fpie also usually make a PCH invalid. */
1479 if (data[0] != flag_pic)
1480 return _("created and used with different settings of -fpic");
1481 if (data[1] != flag_pie)
1482 return _("created and used with different settings of -fpie");
1485 /* Check target_flags. */
1486 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
1488 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
1493 memcpy (&tf, data, sizeof (target_flags));
1495 bits = target_switches[i].value;
1498 if ((target_flags & bits) != (tf & bits))
1500 flag_that_differs = target_switches[i].name;
1506 data += sizeof (target_flags);
1507 len -= sizeof (target_flags);
1509 /* Check string options. */
1510 #ifdef TARGET_OPTIONS
1511 for (i = 0; i < ARRAY_SIZE (target_options); i++)
1513 const char *str = *target_options[i].variable;
1517 l = strlen (str) + 1;
1518 if (len < l || memcmp (data, str, l) != 0)
1520 flag_that_differs = target_options[i].prefix;
1533 asprintf (&r, _("created and used with differing settings of `-m%s'"),
1536 return _("out of memory");
1541 /* Default tree printer. Handles declarations only. */
1543 default_tree_printer (pretty_printer * pp, text_info *text)
1545 switch (*text->format_spec)
1551 tree t = va_arg (*text->args_ptr, tree);
1552 const char *n = DECL_NAME (t)
1553 ? lang_hooks.decl_printable_name (t, 2)
1564 /* Initialization of the front end environment, before command line
1565 options are parsed. Signal handlers, internationalization etc.
1566 ARGV0 is main's argv[0]. */
1568 general_init (const char *argv0)
1572 p = argv0 + strlen (argv0);
1573 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1577 xmalloc_set_program_name (progname);
1581 gcc_init_libintl ();
1583 /* Initialize the diagnostics reporting machinery, so option parsing
1584 can give warnings and errors. */
1585 diagnostic_initialize (global_dc);
1586 /* Set a default printer. Language specific initializations will
1587 override it later. */
1588 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1590 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1592 signal (SIGSEGV, crash_signal);
1595 signal (SIGILL, crash_signal);
1598 signal (SIGBUS, crash_signal);
1601 signal (SIGABRT, crash_signal);
1603 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1604 signal (SIGIOT, crash_signal);
1607 signal (SIGFPE, crash_signal);
1610 /* Other host-specific signal setup. */
1611 (*host_hooks.extra_signals)();
1613 /* Initialize the garbage-collector, string pools and tree type hash
1617 linemap_init (&line_table);
1620 /* Initialize register usage now so switches may override. */
1623 /* Register the language-independent parameters. */
1624 add_params (lang_independent_params, LAST_PARAM);
1626 /* This must be done after add_params but before argument processing. */
1627 init_ggc_heuristics();
1628 init_tree_optimization_passes ();
1631 /* Process the options that have been parsed. */
1633 process_options (void)
1635 /* Allow the front end to perform consistency checks and do further
1636 initialization based on the command line options. This hook also
1637 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1638 so we can correctly initialize debug output. */
1639 no_backend = lang_hooks.post_options (&main_input_filename);
1640 #ifndef USE_MAPPED_LOCATION
1641 input_filename = main_input_filename;
1644 #ifdef OVERRIDE_OPTIONS
1645 /* Some machines may reject certain combinations of options. */
1649 if (flag_short_enums == 2)
1650 flag_short_enums = targetm.default_short_enums ();
1652 /* Set aux_base_name if not already set. */
1655 else if (main_input_filename)
1657 char *name = xstrdup (lbasename (main_input_filename));
1659 strip_off_ending (name, strlen (name));
1660 aux_base_name = name;
1663 aux_base_name = "gccaux";
1665 /* Set up the align_*_log variables, defaulting them to 1 if they
1666 were still unset. */
1667 if (align_loops <= 0) align_loops = 1;
1668 if (align_loops_max_skip > align_loops || !align_loops)
1669 align_loops_max_skip = align_loops - 1;
1670 align_loops_log = floor_log2 (align_loops * 2 - 1);
1671 if (align_jumps <= 0) align_jumps = 1;
1672 if (align_jumps_max_skip > align_jumps || !align_jumps)
1673 align_jumps_max_skip = align_jumps - 1;
1674 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1675 if (align_labels <= 0) align_labels = 1;
1676 align_labels_log = floor_log2 (align_labels * 2 - 1);
1677 if (align_labels_max_skip > align_labels || !align_labels)
1678 align_labels_max_skip = align_labels - 1;
1679 if (align_functions <= 0) align_functions = 1;
1680 align_functions_log = floor_log2 (align_functions * 2 - 1);
1682 /* Unrolling all loops implies that standard loop unrolling must also
1684 if (flag_unroll_all_loops)
1685 flag_unroll_loops = 1;
1687 if (flag_unroll_loops)
1689 flag_old_unroll_loops = 0;
1690 flag_old_unroll_all_loops = 0;
1693 if (flag_old_unroll_all_loops)
1694 flag_old_unroll_loops = 1;
1696 /* Old loop unrolling requires that strength_reduction be on also. Silently
1697 turn on strength reduction here if it isn't already on. Also, the loop
1698 unrolling code assumes that cse will be run after loop, so that must
1699 be turned on also. */
1700 if (flag_old_unroll_loops)
1702 flag_strength_reduce = 1;
1703 flag_rerun_cse_after_loop = 1;
1705 if (flag_unroll_loops || flag_peel_loops)
1706 flag_rerun_cse_after_loop = 1;
1708 /* If explicitly asked to run new loop optimizer, switch off the old
1710 if (flag_loop_optimize2)
1711 flag_loop_optimize = 0;
1713 /* Enable new loop optimizer pass if any of its optimizations is called. */
1714 if (flag_move_loop_invariants
1715 || flag_unswitch_loops
1717 || flag_unroll_loops
1718 || flag_branch_on_count_reg)
1719 flag_loop_optimize2 = 1;
1721 if (flag_non_call_exceptions)
1722 flag_asynchronous_unwind_tables = 1;
1723 if (flag_asynchronous_unwind_tables)
1724 flag_unwind_tables = 1;
1726 /* Disable unit-at-a-time mode for frontends not supporting callgraph
1728 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
1729 flag_unit_at_a_time = 0;
1731 if (flag_value_profile_transformations)
1732 flag_profile_values = 1;
1734 /* Speculative prefetching implies the value profiling. We also switch off
1735 the prefetching in the loop optimizer, so that we do not emit double
1736 prefetches. TODO -- we should teach these two to cooperate; the loop
1737 based prefetching may sometimes do a better job, especially in connection
1738 with reuse analysis. */
1739 if (flag_speculative_prefetching)
1741 flag_profile_values = 1;
1742 flag_prefetch_loop_arrays = 0;
1745 /* Warn about options that are not supported on this machine. */
1746 #ifndef INSN_SCHEDULING
1747 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1748 warning ("instruction scheduling not supported on this target machine");
1751 if (flag_delayed_branch)
1752 warning ("this target machine does not have delayed branches");
1755 if (flag_tree_based_profiling && flag_test_coverage)
1756 sorry ("test-coverage not yet implemented in trees.");
1757 if (flag_tree_based_profiling && flag_profile_values)
1758 sorry ("value-based profiling not yet implemented in trees.");
1760 user_label_prefix = USER_LABEL_PREFIX;
1761 if (flag_leading_underscore != -1)
1763 /* If the default prefix is more complicated than "" or "_",
1764 issue a warning and ignore this option. */
1765 if (user_label_prefix[0] == 0 ||
1766 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1768 user_label_prefix = flag_leading_underscore ? "_" : "";
1771 warning ("-f%sleading-underscore not supported on this target machine",
1772 flag_leading_underscore ? "" : "no-");
1775 /* If we are in verbose mode, write out the version and maybe all the
1776 option flags in use. */
1779 print_version (stderr, "");
1781 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
1784 if (flag_syntax_only)
1786 write_symbols = NO_DEBUG;
1790 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1792 if (debug_info_level == DINFO_LEVEL_NONE)
1793 write_symbols = NO_DEBUG;
1795 /* Now we know write_symbols, set up the debug hooks based on it.
1796 By default we do nothing for debug output. */
1797 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1798 default_debug_hooks = &do_nothing_debug_hooks;
1799 #if defined(DBX_DEBUGGING_INFO)
1800 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1801 default_debug_hooks = &dbx_debug_hooks;
1803 #if defined(XCOFF_DEBUGGING_INFO)
1804 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1805 default_debug_hooks = &xcoff_debug_hooks;
1807 #ifdef SDB_DEBUGGING_INFO
1808 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1809 default_debug_hooks = &sdb_debug_hooks;
1811 #ifdef DWARF2_DEBUGGING_INFO
1812 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1813 default_debug_hooks = &dwarf2_debug_hooks;
1815 #ifdef VMS_DEBUGGING_INFO
1816 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1817 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1818 default_debug_hooks = &vmsdbg_debug_hooks;
1821 debug_hooks = &do_nothing_debug_hooks;
1822 if (write_symbols == NO_DEBUG)
1824 #if defined(DBX_DEBUGGING_INFO)
1825 else if (write_symbols == DBX_DEBUG)
1826 debug_hooks = &dbx_debug_hooks;
1828 #if defined(XCOFF_DEBUGGING_INFO)
1829 else if (write_symbols == XCOFF_DEBUG)
1830 debug_hooks = &xcoff_debug_hooks;
1832 #ifdef SDB_DEBUGGING_INFO
1833 else if (write_symbols == SDB_DEBUG)
1834 debug_hooks = &sdb_debug_hooks;
1836 #ifdef DWARF2_DEBUGGING_INFO
1837 else if (write_symbols == DWARF2_DEBUG)
1838 debug_hooks = &dwarf2_debug_hooks;
1840 #ifdef VMS_DEBUGGING_INFO
1841 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1842 debug_hooks = &vmsdbg_debug_hooks;
1845 error ("target system does not support the \"%s\" debug format",
1846 debug_type_names[write_symbols]);
1848 /* Now we know which debug output will be used so we can set
1849 flag_var_tracking, flag_rename_registers and flag_web if the user has
1850 not specified them. */
1851 if (debug_info_level < DINFO_LEVEL_NORMAL
1852 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1854 if (flag_var_tracking == 1)
1856 if (debug_info_level < DINFO_LEVEL_NORMAL)
1857 warning ("variable tracking requested, but useless unless "
1858 "producing debug info");
1860 warning ("variable tracking requested, but not supported "
1861 "by this debug format");
1863 flag_var_tracking = 0;
1866 if (flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING)
1867 flag_rename_registers = default_debug_hooks->var_location
1868 != do_nothing_debug_hooks.var_location;
1870 if (flag_web == AUTODETECT_FLAG_VAR_TRACKING)
1871 flag_web = optimize >= 2 && (default_debug_hooks->var_location
1872 != do_nothing_debug_hooks.var_location);
1874 if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING)
1875 flag_var_tracking = optimize >= 1;
1877 /* If auxiliary info generation is desired, open the output file.
1878 This goes in the same directory as the source file--unlike
1879 all the other output files. */
1880 if (flag_gen_aux_info)
1882 aux_info_file = fopen (aux_info_file_name, "w");
1883 if (aux_info_file == 0)
1884 fatal_error ("can't open %s: %m", aux_info_file_name);
1887 if (! targetm.have_named_sections)
1889 if (flag_function_sections)
1891 warning ("-ffunction-sections not supported for this target");
1892 flag_function_sections = 0;
1894 if (flag_data_sections)
1896 warning ("-fdata-sections not supported for this target");
1897 flag_data_sections = 0;
1901 if (flag_function_sections && profile_flag)
1903 warning ("-ffunction-sections disabled; it makes profiling impossible");
1904 flag_function_sections = 0;
1907 #ifndef HAVE_prefetch
1908 if (flag_prefetch_loop_arrays)
1910 warning ("-fprefetch-loop-arrays not supported for this target");
1911 flag_prefetch_loop_arrays = 0;
1913 if (flag_speculative_prefetching)
1915 if (flag_speculative_prefetching_set)
1916 warning ("-fspeculative-prefetching not supported for this target");
1917 flag_speculative_prefetching = 0;
1920 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1922 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
1923 flag_prefetch_loop_arrays = 0;
1925 if (flag_speculative_prefetching && !HAVE_prefetch)
1927 if (flag_speculative_prefetching_set)
1928 warning ("-fspeculative-prefetching not supported for this target (try -march switches)");
1929 flag_speculative_prefetching = 0;
1933 /* This combination of options isn't handled for i386 targets and doesn't
1934 make much sense anyway, so don't allow it. */
1935 if (flag_prefetch_loop_arrays && optimize_size)
1937 warning ("-fprefetch-loop-arrays is not supported with -Os");
1938 flag_prefetch_loop_arrays = 0;
1941 #ifndef OBJECT_FORMAT_ELF
1942 if (flag_function_sections && write_symbols != NO_DEBUG)
1943 warning ("-ffunction-sections may affect debugging on some targets");
1946 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1947 if (flag_signaling_nans)
1948 flag_trapping_math = 1;
1951 /* Initialize the compiler back end. */
1955 init_adjust_machine_modes ();
1957 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
1958 || debug_info_level == DINFO_LEVEL_VERBOSE
1959 #ifdef VMS_DEBUGGING_INFO
1960 /* Enable line number info for traceback. */
1961 || debug_info_level > DINFO_LEVEL_NONE
1963 || flag_test_coverage);
1966 init_fake_stack_mems ();
1970 init_function_once ();
1971 init_varasm_once ();
1973 /* The following initialization functions need to generate rtl, so
1974 provide a dummy function context for them. */
1975 init_dummy_function_start ();
1977 if (flag_caller_saves)
1978 init_caller_save ();
1979 expand_dummy_function_end ();
1982 /* Language-dependent initialization. Returns nonzero on success. */
1984 lang_dependent_init (const char *name)
1986 location_t save_loc = input_location;
1987 if (dump_base_name == 0)
1988 dump_base_name = name && name[0] ? name : "gccdump";
1990 /* Other front-end initialization. */
1991 #ifdef USE_MAPPED_LOCATION
1992 input_location = BUILTINS_LOCATION;
1994 input_filename = "<built-in>";
1997 if (lang_hooks.init () == 0)
1999 input_location = save_loc;
2001 init_asm_output (name);
2003 /* These create various _DECL nodes, so need to be called after the
2004 front end is initialized. */
2008 /* The following initialization functions need to generate rtl, so
2009 provide a dummy function context for them. */
2010 init_dummy_function_start ();
2012 expand_dummy_function_end ();
2014 /* If dbx symbol table desired, initialize writing it and output the
2015 predefined types. */
2016 timevar_push (TV_SYMOUT);
2018 #ifdef DWARF2_UNWIND_INFO
2019 if (dwarf2out_do_frame ())
2020 dwarf2out_frame_init ();
2023 /* Now we have the correct original filename, we can initialize
2025 (*debug_hooks->init) (name);
2027 timevar_pop (TV_SYMOUT);
2032 /* Clean up: close opened files, etc. */
2037 /* Close the dump files. */
2038 if (flag_gen_aux_info)
2040 fclose (aux_info_file);
2042 unlink (aux_info_file_name);
2045 /* Close non-debugging input and output files. Take special care to note
2046 whether fclose returns an error, since the pages might still be on the
2047 buffer chain while the file is open. */
2051 if (ferror (asm_out_file) != 0)
2052 fatal_error ("error writing to %s: %m", asm_file_name);
2053 if (fclose (asm_out_file) != 0)
2054 fatal_error ("error closing %s: %m", asm_file_name);
2057 finish_optimization_passes ();
2061 ggc_print_statistics ();
2062 stringpool_statistics ();
2063 dump_tree_statistics ();
2064 dump_rtx_statistics ();
2065 dump_varray_statistics ();
2066 dump_alloc_pool_statistics ();
2067 dump_ggc_loc_statistics ();
2070 /* Free up memory for the benefit of leak detectors. */
2073 /* Language-specific end of compilation actions. */
2074 lang_hooks.finish ();
2077 /* Initialize the compiler, and compile the input file. */
2081 /* Initialize timing first. The C front ends read the main file in
2082 the post_options hook, and C++ does file timings. */
2083 if (time_report || !quiet_flag || flag_detailed_statistics)
2085 timevar_start (TV_TOTAL);
2089 /* Don't do any more if an error has already occurred. */
2092 /* Set up the back-end if requested. */
2096 /* Language-dependent initialization. Returns true on success. */
2097 if (lang_dependent_init (main_input_filename))
2103 /* Stop timing and print the times. */
2104 timevar_stop (TV_TOTAL);
2105 timevar_print (stderr);
2108 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2109 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2110 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2112 It is not safe to call this function more than once. */
2115 toplev_main (unsigned int argc, const char **argv)
2119 /* Initialization of GCC's environment, and diagnostics. */
2120 general_init (argv[0]);
2122 /* Parse the options and do minimal processing; basically just
2123 enough to default flags appropriately. */
2124 decode_options (argc, argv);
2128 /* Exit early if we can (e.g. -help). */
2129 if (!exit_after_options)
2132 if (errorcount || sorrycount)
2133 return (FATAL_EXIT_CODE);
2135 return (SUCCESS_EXIT_CODE);