gcc/java/lang.c

   1 /* Java(TM) language-specific utility routines.
   2    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.
  21
  22 Java and all Java-based marks are trademarks or registered trademarks
  23 of Sun Microsystems, Inc. in the United States and other countries.
  24 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  25
  26 /* Hacked by Per Bothner <bothner@cygnus.com> February 1996. */
  27
  28 #include "config.h"
  29 #include "system.h"
  30 #include "tree.h"
  31 #include "input.h"
  32 #include "rtl.h"
  33 #include "expr.h"
  34 #include "java-tree.h"
  35 #include "jcf.h"
  36 #include "toplev.h"
  37 #include "flags.h"
  38 #include "xref.h"
  39 #include "ggc.h"
  40
  41 struct string_option
  42 {
  43   const char *string;
  44   int *variable;
  45   int on_value;
  46 };
  47
  48 static void java_init PARAMS ((void));
  49 static void java_init_options PARAMS ((void));
  50 static int java_decode_option PARAMS ((int, char **));
  51 static void put_decl_string PARAMS ((const char *, int));
  52 static void put_decl_node PARAMS ((tree));
  53 static void java_dummy_print PARAMS ((const char *));
  54 static void lang_print_error PARAMS ((const char *));
  55 static int process_option_with_no PARAMS ((char *,
  56                                            struct string_option *,
  57                                            int));
  58
  59 #ifndef OBJECT_SUFFIX
  60 # define OBJECT_SUFFIX ".o"
  61 #endif
  62
  63 /* Table indexed by tree code giving a string containing a character
  64    classifying the tree code.  Possibilities are
  65    t, d, s, c, r, <, 1 and 2.  See java/java-tree.def for details.  */
  66
  67 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
  68
  69 char java_tree_code_type[] = {
  70   'x',
  71 #include "java-tree.def"
  72 };
  73 #undef DEFTREECODE
  74
  75 /* Table indexed by tree code giving number of expression
  76    operands beyond the fixed part of the node structure.
  77    Not used for types or decls.  */
  78
  79 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
  80
  81 int java_tree_code_length[] = {
  82   0,
  83 #include "java-tree.def"
  84 };
  85 #undef DEFTREECODE
  86
  87 /* Names of tree components.
  88    Used for printing out the tree and error messages.  */
  89 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
  90
  91 const char *java_tree_code_name[] = {
  92   "@@dummy",
  93 #include "java-tree.def"
  94 };
  95 #undef DEFTREECODE
  96
  97 int compiling_from_source;
  98
  99 const char * const language_string = "GNU Java";
 100
 101 /* Nonzero if we should make is_compiled_class always return 1 for
 102    appropriate classes that we're referencing.  */
 103
 104 int flag_assume_compiled = 1;
 105
 106 int flag_emit_class_files = 0;
 107
 108 /* When non zero, we emit xref strings. Values of the flag for xref
 109    backends are defined in xref_flag_table, xref.c.  */
 110
 111 int flag_emit_xref = 0;
 112
 113 /* When non zero, -Wall was turned on.  */
 114 int flag_wall = 0;
 115
 116 /* When non zero, check for redundant modifier uses.  */
 117 int flag_redundant = 0;
 118
 119 /* When non zero, warns about overridings that don't occur.  */
 120 int flag_not_overriding = 0;
 121
 122 /* When non zero, warns that final local are treated as non final.  */
 123 int flag_static_local_jdk1_1 = 0;
 124
 125 /* When non zero, call a library routine to do integer divisions. */
 126 int flag_use_divide_subroutine = 1;
 127
 128 /* When non zero, generate code for the Boehm GC.  */
 129 int flag_use_boehm_gc = 0;
 130
 131 /* When non zero, assume the runtime uses a hash table to map an
 132    object to its synchronization structure.  */
 133 int flag_hash_synchronization;
 134
 135 /* When non zero, assume all native functions are implemented with
 136    JNI, not CNI.  */
 137 int flag_jni = 0;
 138
 139 /* When non zero, warn when source file is newer than matching class
 140    file.  */
 141 int flag_newer = 1;
 142
 143 /* The encoding of the source file.  */
 144 const char *current_encoding = NULL;
 145
 146 /* When non zero, report the now deprecated empty statements.  */
 147 int flag_extraneous_semicolon;
 148
 149 /* From gcc/flags.h, and indicates if exceptions are turned on or not.  */
 150
 151 extern int flag_new_exceptions;
 152 extern int flag_exceptions;
 153
 154 /* Table of language-dependent -f options.
 155    STRING is the option name.  VARIABLE is the address of the variable.
 156    ON_VALUE is the value to store in VARIABLE
 157     if `-fSTRING' is seen as an option.
 158    (If `-fno-STRING' is seen as an option, the opposite value is stored.)  */
 159
 160 static struct string_option
 161 lang_f_options[] =
 162 {
 163   {"emit-class-file", &flag_emit_class_files, 1},
 164   {"emit-class-files", &flag_emit_class_files, 1},
 165   {"use-divide-subroutine", &flag_use_divide_subroutine, 1},
 166   {"use-boehm-gc", &flag_use_boehm_gc, 1},
 167   {"hash-synchronization", &flag_hash_synchronization, 1},
 168   {"jni", &flag_jni, 1}
 169 };
 170
 171 static struct string_option
 172 lang_W_options[] =
 173 {
 174   { "unsupported-jdk11", &flag_static_local_jdk1_1, 1 },
 175   { "redundant-modifiers", &flag_redundant, 1 },
 176   { "extraneous-semicolon", &flag_extraneous_semicolon, 1 },
 177   { "out-of-date", &flag_newer, 1 }
 178 };
 179
 180 JCF *current_jcf;
 181
 182 /* Variable controlling how dependency tracking is enabled in
 183    init_parse.  */
 184 static int dependency_tracking = 0;
 185
 186 /* Flag values for DEPENDENCY_TRACKING.  */
 187 #define DEPEND_SET_FILE 1
 188 #define DEPEND_ENABLE   2
 189 #define DEPEND_TARGET_SET 4
 190 #define DEPEND_FILE_ALREADY_SET 8
 191
 192 /* Each front end provides its own.  */
 193 struct lang_hooks lang_hooks = {java_init,
 194                                 NULL, /* java_finish */
 195                                 java_init_options,
 196                                 java_decode_option,
 197                                 NULL /* post_options */};
 198
 199 /* Process an option that can accept a `no-' form.
 200    Return 1 if option found, 0 otherwise.  */
 201 static int
 202 process_option_with_no (p, table, table_size)
 203      char *p;
 204      struct string_option *table;
 205      int table_size;
 206 {
 207   int j;
 208
 209   for (j = 0; j < table_size; j++)
 210     {
 211       if (!strcmp (p, table[j].string))
 212         {
 213           *table[j].variable = table[j].on_value;
 214           return 1;
 215         }
 216       if (p[0] == 'n' && p[1] == 'o' && p[2] == '-'
 217           && ! strcmp (p+3, table[j].string))
 218         {
 219           *table[j].variable = ! table[j].on_value;
 220           return 1;
 221         }
 222     }
 223
 224   return 0;
 225 }
 226
 227 /*
 228  * process java-specific compiler command-line options
 229  * return 0, but do not complain if the option is not recognised.
 230  */
 231 static int
 232 java_decode_option (argc, argv)
 233      int argc __attribute__ ((__unused__));
 234      char **argv;
 235 {
 236   char *p = argv[0];
 237
 238 #define CLARG "-fassume-compiled="
 239   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 240     {
 241       add_assume_compiled (p + sizeof (CLARG) - 1, 0);
 242       return 1;
 243     }
 244 #undef CLARG
 245 #define CLARG "-fno-assume-compiled="
 246   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 247     {
 248       add_assume_compiled (p + sizeof (CLARG) - 1, 1);
 249       return 1;
 250     }
 251 #undef CLARG
 252 #define CLARG "-fassume-compiled"
 253   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 254     {
 255       add_assume_compiled ("", 0);
 256       return 1;
 257     }
 258 #undef CLARG
 259 #define CLARG "-fno-assume-compiled"
 260   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 261     {
 262       add_assume_compiled ("", 1);
 263       return 1;
 264     }
 265 #undef CLARG
 266 #define CLARG "-fclasspath="
 267   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 268     {
 269       jcf_path_classpath_arg (p + sizeof (CLARG) - 1);
 270       return 1;
 271     }
 272 #undef CLARG
 273 #define CLARG "-fCLASSPATH="
 274   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 275     {
 276       jcf_path_CLASSPATH_arg (p + sizeof (CLARG) - 1);
 277       return 1;
 278     }
 279 #undef CLARG
 280   else if (strncmp (p, "-I", 2) == 0)
 281     {
 282       jcf_path_include_arg (p + 2);
 283       return 1;
 284     }
 285
 286 #define ARG "-foutput-class-dir="
 287   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 288     {
 289       jcf_write_base_directory = p + sizeof (ARG) - 1;
 290       return 1;
 291     }
 292 #undef ARG
 293 #define ARG "-fencoding="
 294   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 295     {
 296       current_encoding = p + sizeof (ARG) - 1;
 297       return 1;
 298     }
 299 #undef ARG
 300
 301   if (p[0] == '-' && p[1] == 'f')
 302     {
 303       /* Some kind of -f option.
 304          P's value is the option sans `-f'.
 305          Search for it in the table of options.  */
 306       p += 2;
 307       return process_option_with_no (p, lang_f_options,
 308                                      ARRAY_SIZE (lang_f_options));
 309     }
 310
 311   if (strcmp (p, "-Wall") == 0)
 312     {
 313       flag_wall = 1;
 314       flag_redundant = 1;
 315       flag_extraneous_semicolon = 1;
 316       /* When -Wall given, enable -Wunused.  We do this because the C
 317          compiler does it, and people expect it.  */
 318       set_Wunused (1);
 319       return 1;
 320     }
 321
 322   if (p[0] == '-' && p[1] == 'W')
 323     {
 324       /* Skip `-W' and see if we accept the option or its `no-' form.  */
 325       p += 2;
 326       return process_option_with_no (p, lang_W_options,
 327                                      ARRAY_SIZE (lang_W_options));
 328     }
 329
 330   if (strcmp (p, "-MD") == 0)
 331     {
 332       jcf_dependency_init (1);
 333       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 334       return 1;
 335     }
 336   else if (strcmp (p, "-MMD") == 0)
 337     {
 338       jcf_dependency_init (0);
 339       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 340       return 1;
 341     }
 342   else if (strcmp (p, "-M") == 0)
 343     {
 344       jcf_dependency_init (1);
 345       dependency_tracking |= DEPEND_ENABLE;
 346       return 1;
 347     }
 348   else if (strcmp (p, "-MM") == 0)
 349     {
 350       jcf_dependency_init (0);
 351       dependency_tracking |= DEPEND_ENABLE;
 352       return 1;
 353     }
 354   else if (strcmp (p, "-MP") == 0)
 355     {
 356       jcf_dependency_print_dummies ();
 357       return 1;
 358     }
 359   else if (strcmp (p, "-MT") == 0)
 360     {
 361       jcf_dependency_set_target (argv[1]);
 362       dependency_tracking |= DEPEND_TARGET_SET;
 363       return 2;
 364     }
 365   else if (strcmp (p, "-MF") == 0)
 366     {
 367       jcf_dependency_set_dep_file (argv[1]);
 368       dependency_tracking |= DEPEND_FILE_ALREADY_SET;
 369       return 2;
 370     }
 371
 372   return 0;
 373 }
 374
 375 /* Global open file.  */
 376 FILE *finput;
 377
 378 const char *
 379 init_parse (filename)
 380      const char *filename;
 381 {
 382   /* Open input file.  */
 383
 384   if (filename == 0 || !strcmp (filename, "-"))
 385     {
 386       finput = stdin;
 387       filename = "stdin";
 388
 389       if (dependency_tracking)
 390         error ("can't do dependency tracking with input from stdin");
 391     }
 392   else
 393     {
 394       if (dependency_tracking)
 395         {
 396           char *dot;
 397
 398           /* If the target is set and the output filename is set, then
 399              there's no processing to do here.  Otherwise we must
 400              compute one or the other.  */
 401           if (! ((dependency_tracking & DEPEND_TARGET_SET)
 402                  && (dependency_tracking & DEPEND_FILE_ALREADY_SET)))
 403             {
 404               dot = strrchr (filename, '.');
 405               if (dot == NULL)
 406                 error ("couldn't determine target name for dependency tracking");
 407               else
 408                 {
 409                   char *buf = (char *) xmalloc (dot - filename +
 410                                                 3 + sizeof (OBJECT_SUFFIX));
 411                   strncpy (buf, filename, dot - filename);
 412
 413                   /* If emitting class files, we might have multiple
 414                      targets.  The class generation code takes care of
 415                      registering them.  Otherwise we compute the
 416                      target name here.  */
 417                   if ((dependency_tracking & DEPEND_TARGET_SET))
 418                     ; /* Nothing.  */
 419                   else if (flag_emit_class_files)
 420                     jcf_dependency_set_target (NULL);
 421                   else
 422                     {
 423                       strcpy (buf + (dot - filename), OBJECT_SUFFIX);
 424                       jcf_dependency_set_target (buf);
 425                     }
 426
 427                   if ((dependency_tracking & DEPEND_FILE_ALREADY_SET))
 428                     ; /* Nothing.  */
 429                   else if ((dependency_tracking & DEPEND_SET_FILE))
 430                     {
 431                       strcpy (buf + (dot - filename), ".d");
 432                       jcf_dependency_set_dep_file (buf);
 433                     }
 434                   else
 435                     jcf_dependency_set_dep_file ("-");
 436
 437                   free (buf);
 438                 }
 439             }
 440         }
 441     }
 442
 443   init_lex ();
 444
 445   return filename;
 446 }
 447
 448 void
 449 finish_parse ()
 450 {
 451   jcf_dependency_write ();
 452 }
 453
 454 /* Buffer used by lang_printable_name. */
 455 static char *decl_buf = NULL;
 456
 457 /* Allocated size of decl_buf. */
 458 static int decl_buflen = 0;
 459
 460 /* Length of used part of decl_buf;  position for next character. */
 461 static int decl_bufpos = 0;
 462
 463 /* Append the string STR to decl_buf.
 464    It length is given by LEN;  -1 means the string is nul-terminated. */
 465
 466 static void
 467 put_decl_string (str, len)
 468      const char *str;
 469      int len;
 470 {
 471   if (len < 0)
 472     len = strlen (str);
 473   if (decl_bufpos + len >= decl_buflen)
 474     {
 475       if (decl_buf == NULL)
 476         {
 477           decl_buflen = len + 100;
 478           decl_buf = (char *) xmalloc (decl_buflen);
 479         }
 480       else
 481         {
 482           decl_buflen *= 2;
 483           decl_buf = (char *) xrealloc (decl_buf, decl_buflen);
 484         }
 485     }
 486   strcpy (decl_buf + decl_bufpos, str);
 487   decl_bufpos += len;
 488 }
 489
 490 /* Append to decl_buf a printable name for NODE. */
 491
 492 static void
 493 put_decl_node (node)
 494      tree node;
 495 {
 496   int was_pointer = 0;
 497   if (TREE_CODE (node) == POINTER_TYPE)
 498     {
 499       node = TREE_TYPE (node);
 500       was_pointer = 1;
 501     }
 502   if (TREE_CODE_CLASS (TREE_CODE (node)) == 'd'
 503       && DECL_NAME (node) != NULL_TREE)
 504     {
 505 #if 0
 506       if (DECL_CONTEXT (node) != NULL_TREE)
 507         {
 508           put_decl_node (DECL_CONTEXT (node));
 509           put_decl_string (".", 1);
 510         }
 511 #endif
 512       if (TREE_CODE (node) == FUNCTION_DECL
 513           && DECL_INIT_P (node)
 514           && !DECL_ARTIFICIAL (node) && current_class)
 515         put_decl_node (TYPE_NAME (current_class));
 516       else
 517         put_decl_node (DECL_NAME (node));
 518       if (TREE_CODE (node) == FUNCTION_DECL && TREE_TYPE (node) != NULL_TREE)
 519         {
 520           int i = 0;
 521           tree args = TYPE_ARG_TYPES (TREE_TYPE (node));
 522           if (TREE_CODE (TREE_TYPE (node)) == METHOD_TYPE)
 523             args = TREE_CHAIN (args);
 524           put_decl_string ("(", 1);
 525           for ( ; args != end_params_node;  args = TREE_CHAIN (args), i++)
 526             {
 527               if (i > 0)
 528                 put_decl_string (",", 1);
 529               put_decl_node (TREE_VALUE (args));
 530             }
 531           put_decl_string (")", 1);
 532         }
 533     }
 534   else if (TREE_CODE_CLASS (TREE_CODE (node)) == 't'
 535       && TYPE_NAME (node) != NULL_TREE)
 536     {
 537       if (TREE_CODE (node) == RECORD_TYPE && TYPE_ARRAY_P (node))
 538         {
 539           put_decl_node (TYPE_ARRAY_ELEMENT (node));
 540           put_decl_string("[]", 2);
 541         }
 542       else if (node == promoted_byte_type_node)
 543         put_decl_string ("byte", 4);
 544       else if (node == promoted_short_type_node)
 545         put_decl_string ("short", 5);
 546       else if (node == promoted_char_type_node)
 547         put_decl_string ("char", 4);
 548       else if (node == promoted_boolean_type_node)
 549         put_decl_string ("boolean", 7);
 550       else if (node == void_type_node && was_pointer)
 551         put_decl_string ("null", 4);
 552       else
 553         put_decl_node (TYPE_NAME (node));
 554     }
 555   else if (TREE_CODE (node) == IDENTIFIER_NODE)
 556     put_decl_string (IDENTIFIER_POINTER (node), IDENTIFIER_LENGTH (node));
 557   else
 558     put_decl_string ("<unknown>", -1);
 559 }
 560
 561 /* Return a user-friendly name for DECL.
 562    The resulting string is only valid until the next call.
 563    The value of the hook decl_printable_name is this function,
 564    which is also called directly by lang_print_error. */
 565
 566 const char *
 567 lang_printable_name (decl, v)
 568      tree decl;
 569      int v  __attribute__ ((__unused__));
 570 {
 571   decl_bufpos = 0;
 572   put_decl_node (decl);
 573   put_decl_string ("", 1);
 574   return decl_buf;
 575 }
 576
 577 /* Print on stderr the current class and method context.  This function
 578    is the value of the hook print_error_function, called from toplev.c. */
 579
 580 static void
 581 lang_print_error (file)
 582      const char *file;
 583 {
 584   static tree last_error_function_context = NULL_TREE;
 585   static tree last_error_function = NULL;
 586   static int initialized_p;
 587
 588   /* Register LAST_ERROR_FUNCTION_CONTEXT and LAST_ERROR_FUNCTION with
 589      the garbage collector.  */
 590   if (!initialized_p)
 591     {
 592       ggc_add_tree_root (&last_error_function_context, 1);
 593       ggc_add_tree_root (&last_error_function, 1);
 594       initialized_p = 1;
 595     }
 596
 597   if (current_function_decl != NULL
 598       && DECL_CONTEXT (current_function_decl) != last_error_function_context)
 599     {
 600       if (file)
 601         fprintf (stderr, "%s: ", file);
 602
 603       last_error_function_context = DECL_CONTEXT (current_function_decl);
 604       fprintf (stderr, "In class `%s':\n",
 605                lang_printable_name (last_error_function_context, 0));
 606     }
 607   if (last_error_function != current_function_decl)
 608     {
 609       if (file)
 610         fprintf (stderr, "%s: ", file);
 611
 612       if (current_function_decl == NULL)
 613         fprintf (stderr, "At top level:\n");
 614       else
 615         {
 616           const char *name = lang_printable_name (current_function_decl, 2);
 617           fprintf (stderr, "In method `%s':\n", name);
 618         }
 619
 620       last_error_function = current_function_decl;
 621     }
 622
 623 }
 624
 625 static void
 626 java_init ()
 627 {
 628 #if 0
 629   extern int flag_minimal_debug;
 630   flag_minimal_debug = 0;
 631 #endif
 632
 633   jcf_path_init ();
 634   jcf_path_seal ();
 635
 636   decl_printable_name = lang_printable_name;
 637   print_error_function = lang_print_error;
 638   lang_expand_expr = java_lang_expand_expr;
 639
 640   flag_exceptions = 1;
 641
 642   /* Append to Gcc tree node definition arrays */
 643
 644   memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
 645           java_tree_code_type,
 646           (int)LAST_JAVA_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
 647   memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
 648           java_tree_code_length,
 649           (LAST_JAVA_TREE_CODE -
 650            (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
 651   memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
 652           java_tree_code_name,
 653           (LAST_JAVA_TREE_CODE -
 654            (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));
 655
 656   using_eh_for_cleanups ();
 657 }
 658
 659 /* This doesn't do anything on purpose. It's used to satisfy the
 660    print_error_function hook we don't print error messages with bogus
 661    function prototypes.  */
 662
 663 static void
 664 java_dummy_print (s)
 665      const char *s __attribute__ ((__unused__));
 666 {
 667 }
 668
 669 /* Called to install the PRINT_ERROR_FUNCTION hook differently
 670    according to LEVEL. LEVEL is 1 during early parsing, when function
 671    prototypes aren't fully resolved. print_error_function is set so it
 672    doesn't print incomplete function prototypes. When LEVEL is 2,
 673    function prototypes are fully resolved and can be printed when
 674    reporting errors.  */
 675
 676 void lang_init_source (level)
 677      int level;
 678 {
 679   if (level == 1)
 680     print_error_function = java_dummy_print;
 681   else
 682     print_error_function = lang_print_error;
 683 }
 684
 685 static void
 686 java_init_options ()
 687 {
 688   flag_new_exceptions = 1;
 689   flag_bounds_check = 1;
 690 }
 691
 692 const char *
 693 lang_identify ()
 694 {
 695   return "Java";
 696 }
 697
 698 /* Hooks for print_node.  */
 699
 700 void
 701 print_lang_decl (file, node, indent)
 702      FILE *file __attribute ((__unused__));
 703      tree node __attribute ((__unused__));
 704      int indent __attribute ((__unused__));
 705 {
 706 }
 707
 708 void
 709 print_lang_type (file, node, indent)
 710      FILE *file __attribute ((__unused__));
 711      tree node __attribute ((__unused__));
 712      int indent __attribute ((__unused__));
 713 {
 714 }
 715
 716 void
 717 print_lang_identifier (file, node, indent)
 718      FILE *file __attribute ((__unused__));
 719      tree node __attribute ((__unused__));
 720      int indent __attribute ((__unused__));
 721 {
 722 }
 723
 724 void
 725 print_lang_statistics ()
 726 {
 727 }
 728
 729 /* used by print-tree.c */
 730
 731 void
 732 lang_print_xnode (file, node, indent)
 733      FILE *file __attribute ((__unused__));
 734      tree node __attribute ((__unused__));
 735      int indent __attribute ((__unused__));
 736 {
 737 }
 738
 739 /* Return the typed-based alias set for T, which may be an expression
 740    or a type.  Return -1 if we don't do anything special.  */
 741
 742 HOST_WIDE_INT
 743 lang_get_alias_set (t)
 744      tree t ATTRIBUTE_UNUSED;
 745 {
 746   return -1;
 747 }