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 #include "diagnostic.h"
  41
  42 struct string_option
  43 {
  44   const char *string;
  45   int *variable;
  46   int on_value;
  47 };
  48
  49 static void java_init PARAMS ((void));
  50 static void java_init_options PARAMS ((void));
  51 static int java_decode_option PARAMS ((int, char **));
  52 static void put_decl_string PARAMS ((const char *, int));
  53 static void put_decl_node PARAMS ((tree));
  54 static void java_dummy_print PARAMS ((diagnostic_context *, const char *));
  55 static void lang_print_error PARAMS ((diagnostic_context *, const char *));
  56 static int process_option_with_no PARAMS ((char *,
  57                                            struct string_option *,
  58                                            int));
  59
  60 #ifndef TARGET_OBJECT_SUFFIX
  61 # define TARGET_OBJECT_SUFFIX ".o"
  62 #endif
  63
  64 /* Table indexed by tree code giving a string containing a character
  65    classifying the tree code.  Possibilities are
  66    t, d, s, c, r, <, 1 and 2.  See java/java-tree.def for details.  */
  67
  68 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
  69
  70 static const char java_tree_code_type[] = {
  71   'x',
  72 #include "java-tree.def"
  73 };
  74 #undef DEFTREECODE
  75
  76 /* Table indexed by tree code giving number of expression
  77    operands beyond the fixed part of the node structure.
  78    Not used for types or decls.  */
  79
  80 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
  81
  82 static const int java_tree_code_length[] = {
  83   0,
  84 #include "java-tree.def"
  85 };
  86 #undef DEFTREECODE
  87
  88 /* Names of tree components.
  89    Used for printing out the tree and error messages.  */
  90 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
  91
  92 static const char *const java_tree_code_name[] = {
  93   "@@dummy",
  94 #include "java-tree.def"
  95 };
  96 #undef DEFTREECODE
  97
  98 int compiling_from_source;
  99
 100 const char * const language_string = "GNU Java";
 101
 102 char * resource_name;
 103
 104 int flag_emit_class_files = 0;
 105
 106 /* Nonzero if input file is a file with a list of filenames to compile. */
 107
 108 int flag_filelist_file = 0;
 109
 110 /* When non zero, we emit xref strings. Values of the flag for xref
 111    backends are defined in xref_flag_table, xref.c.  */
 112
 113 int flag_emit_xref = 0;
 114
 115 /* When non zero, -Wall was turned on.  */
 116 int flag_wall = 0;
 117
 118 /* When non zero, check for redundant modifier uses.  */
 119 int flag_redundant = 0;
 120
 121 /* When non zero, call a library routine to do integer divisions. */
 122 int flag_use_divide_subroutine = 1;
 123
 124 /* When non zero, generate code for the Boehm GC.  */
 125 int flag_use_boehm_gc = 0;
 126
 127 /* When non zero, assume the runtime uses a hash table to map an
 128    object to its synchronization structure.  */
 129 int flag_hash_synchronization;
 130
 131 /* When non zero, assume all native functions are implemented with
 132    JNI, not CNI.  */
 133 int flag_jni = 0;
 134
 135 /* When non zero, warn when source file is newer than matching class
 136    file.  */
 137 int flag_newer = 1;
 138
 139 /* When non zero, generate checks for references to NULL.  */
 140 int flag_check_references = 0;
 141
 142 /* The encoding of the source file.  */
 143 const char *current_encoding = NULL;
 144
 145 /* When non zero, report the now deprecated empty statements.  */
 146 int flag_extraneous_semicolon;
 147
 148 /* When non zero, always check for a non gcj generated classes archive.  */
 149 int flag_force_classes_archive_check;
 150
 151 /* When zero, don't optimize static class initialization. This flag shouldn't
 152    be tested alone, use STATIC_CLASS_INITIALIZATION_OPTIMIZATION_P instead.  */
 153 int flag_optimize_sci = 1;
 154
 155 /* When non zero, print extra version information.  */
 156 static int version_flag = 0;
 157
 158 /* Table of language-dependent -f options.
 159    STRING is the option name.  VARIABLE is the address of the variable.
 160    ON_VALUE is the value to store in VARIABLE
 161     if `-fSTRING' is seen as an option.
 162    (If `-fno-STRING' is seen as an option, the opposite value is stored.)  */
 163
 164 static struct string_option
 165 lang_f_options[] =
 166 {
 167   {"emit-class-file", &flag_emit_class_files, 1},
 168   {"emit-class-files", &flag_emit_class_files, 1},
 169   {"filelist-file", &flag_filelist_file, 1},
 170   {"use-divide-subroutine", &flag_use_divide_subroutine, 1},
 171   {"use-boehm-gc", &flag_use_boehm_gc, 1},
 172   {"hash-synchronization", &flag_hash_synchronization, 1},
 173   {"jni", &flag_jni, 1},
 174   {"check-references", &flag_check_references, 1},
 175   {"force-classes-archive-check", &flag_force_classes_archive_check, 1}
 176 };
 177
 178 static struct string_option
 179 lang_W_options[] =
 180 {
 181   { "redundant-modifiers", &flag_redundant, 1 },
 182   { "extraneous-semicolon", &flag_extraneous_semicolon, 1 },
 183   { "out-of-date", &flag_newer, 1 }
 184 };
 185
 186 JCF *current_jcf;
 187
 188 /* Variable controlling how dependency tracking is enabled in
 189    init_parse.  */
 190 static int dependency_tracking = 0;
 191
 192 /* Flag values for DEPENDENCY_TRACKING.  */
 193 #define DEPEND_SET_FILE 1
 194 #define DEPEND_ENABLE   2
 195 #define DEPEND_TARGET_SET 4
 196 #define DEPEND_FILE_ALREADY_SET 8
 197
 198 /* Each front end provides its own.  */
 199 struct lang_hooks lang_hooks = {java_init,
 200                                 NULL, /* java_finish */
 201                                 java_init_options,
 202                                 java_decode_option,
 203                                 NULL /* post_options */};
 204
 205 /* Process an option that can accept a `no-' form.
 206    Return 1 if option found, 0 otherwise.  */
 207 static int
 208 process_option_with_no (p, table, table_size)
 209      char *p;
 210      struct string_option *table;
 211      int table_size;
 212 {
 213   int j;
 214
 215   for (j = 0; j < table_size; j++)
 216     {
 217       if (!strcmp (p, table[j].string))
 218         {
 219           *table[j].variable = table[j].on_value;
 220           return 1;
 221         }
 222       if (p[0] == 'n' && p[1] == 'o' && p[2] == '-'
 223           && ! strcmp (p+3, table[j].string))
 224         {
 225           *table[j].variable = ! table[j].on_value;
 226           return 1;
 227         }
 228     }
 229
 230   return 0;
 231 }
 232
 233 /*
 234  * process java-specific compiler command-line options
 235  * return 0, but do not complain if the option is not recognised.
 236  */
 237 static int
 238 java_decode_option (argc, argv)
 239      int argc __attribute__ ((__unused__));
 240      char **argv;
 241 {
 242   char *p = argv[0];
 243
 244   if (strcmp (p, "-version") == 0)
 245     {
 246       version_flag = 1;
 247       /* We return 0 so that the caller can process this.  */
 248       return 0;
 249     }
 250
 251 #define CLARG "-fcompile-resource="
 252   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 253     {
 254       resource_name = p + sizeof (CLARG) - 1;
 255       return 1;
 256     }
 257 #undef CLARG
 258 #define CLARG "-fassume-compiled="
 259   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 260     {
 261       add_assume_compiled (p + sizeof (CLARG) - 1, 0);
 262       return 1;
 263     }
 264 #undef CLARG
 265 #define CLARG "-fno-assume-compiled="
 266   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 267     {
 268       add_assume_compiled (p + sizeof (CLARG) - 1, 1);
 269       return 1;
 270     }
 271 #undef CLARG
 272 #define CLARG "-fassume-compiled"
 273   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 274     {
 275       add_assume_compiled ("", 0);
 276       return 1;
 277     }
 278 #undef CLARG
 279 #define CLARG "-fno-assume-compiled"
 280   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 281     {
 282       add_assume_compiled ("", 1);
 283       return 1;
 284     }
 285 #undef CLARG
 286 #define CLARG "-fclasspath="
 287   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 288     {
 289       jcf_path_classpath_arg (p + sizeof (CLARG) - 1);
 290       return 1;
 291     }
 292 #undef CLARG
 293 #define CLARG "-fCLASSPATH="
 294   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 295     {
 296       jcf_path_CLASSPATH_arg (p + sizeof (CLARG) - 1);
 297       return 1;
 298     }
 299 #undef CLARG
 300   else if (strncmp (p, "-I", 2) == 0)
 301     {
 302       jcf_path_include_arg (p + 2);
 303       return 1;
 304     }
 305
 306 #define ARG "-foutput-class-dir="
 307   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 308     {
 309       jcf_write_base_directory = p + sizeof (ARG) - 1;
 310       return 1;
 311     }
 312 #undef ARG
 313 #define ARG "-fencoding="
 314   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 315     {
 316       current_encoding = p + sizeof (ARG) - 1;
 317       return 1;
 318     }
 319 #undef ARG
 320
 321 #undef ARG
 322 #define ARG "-fno-optimize-static-class-initialization"
 323   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 324     {
 325       flag_optimize_sci = 0;
 326       return 1;
 327     }
 328 #undef ARG
 329
 330   if (p[0] == '-' && p[1] == 'f')
 331     {
 332       /* Some kind of -f option.
 333          P's value is the option sans `-f'.
 334          Search for it in the table of options.  */
 335       p += 2;
 336       return process_option_with_no (p, lang_f_options,
 337                                      ARRAY_SIZE (lang_f_options));
 338     }
 339
 340   if (strcmp (p, "-Wall") == 0)
 341     {
 342       flag_wall = 1;
 343       flag_redundant = 1;
 344       flag_extraneous_semicolon = 1;
 345       /* When -Wall given, enable -Wunused.  We do this because the C
 346          compiler does it, and people expect it.  */
 347       set_Wunused (1);
 348       return 1;
 349     }
 350
 351   if (p[0] == '-' && p[1] == 'W')
 352     {
 353       /* Skip `-W' and see if we accept the option or its `no-' form.  */
 354       p += 2;
 355       return process_option_with_no (p, lang_W_options,
 356                                      ARRAY_SIZE (lang_W_options));
 357     }
 358
 359   if (strcmp (p, "-MD") == 0)
 360     {
 361       jcf_dependency_init (1);
 362       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 363       return 1;
 364     }
 365   else if (strcmp (p, "-MMD") == 0)
 366     {
 367       jcf_dependency_init (0);
 368       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 369       return 1;
 370     }
 371   else if (strcmp (p, "-M") == 0)
 372     {
 373       jcf_dependency_init (1);
 374       dependency_tracking |= DEPEND_ENABLE;
 375       return 1;
 376     }
 377   else if (strcmp (p, "-MM") == 0)
 378     {
 379       jcf_dependency_init (0);
 380       dependency_tracking |= DEPEND_ENABLE;
 381       return 1;
 382     }
 383   else if (strcmp (p, "-MP") == 0)
 384     {
 385       jcf_dependency_print_dummies ();
 386       return 1;
 387     }
 388   else if (strcmp (p, "-MT") == 0)
 389     {
 390       jcf_dependency_set_target (argv[1]);
 391       dependency_tracking |= DEPEND_TARGET_SET;
 392       return 2;
 393     }
 394   else if (strcmp (p, "-MF") == 0)
 395     {
 396       jcf_dependency_set_dep_file (argv[1]);
 397       dependency_tracking |= DEPEND_FILE_ALREADY_SET;
 398       return 2;
 399     }
 400
 401   return 0;
 402 }
 403
 404 /* Global open file.  */
 405 FILE *finput;
 406
 407 const char *
 408 init_parse (filename)
 409      const char *filename;
 410 {
 411   /* Open input file.  */
 412
 413   if (filename == 0 || !strcmp (filename, "-"))
 414     {
 415       finput = stdin;
 416       filename = "stdin";
 417
 418       if (dependency_tracking)
 419         error ("can't do dependency tracking with input from stdin");
 420     }
 421   else
 422     {
 423       if (dependency_tracking)
 424         {
 425           char *dot;
 426
 427           /* If the target is set and the output filename is set, then
 428              there's no processing to do here.  Otherwise we must
 429              compute one or the other.  */
 430           if (! ((dependency_tracking & DEPEND_TARGET_SET)
 431                  && (dependency_tracking & DEPEND_FILE_ALREADY_SET)))
 432             {
 433               dot = strrchr (filename, '.');
 434               if (dot == NULL)
 435                 error ("couldn't determine target name for dependency tracking");
 436               else
 437                 {
 438                   char *buf = (char *) xmalloc (dot - filename +
 439                                                 3 + sizeof (TARGET_OBJECT_SUFFIX));
 440                   strncpy (buf, filename, dot - filename);
 441
 442                   /* If emitting class files, we might have multiple
 443                      targets.  The class generation code takes care of
 444                      registering them.  Otherwise we compute the
 445                      target name here.  */
 446                   if ((dependency_tracking & DEPEND_TARGET_SET))
 447                     ; /* Nothing.  */
 448                   else if (flag_emit_class_files)
 449                     jcf_dependency_set_target (NULL);
 450                   else
 451                     {
 452                       strcpy (buf + (dot - filename), TARGET_OBJECT_SUFFIX);
 453                       jcf_dependency_set_target (buf);
 454                     }
 455
 456                   if ((dependency_tracking & DEPEND_FILE_ALREADY_SET))
 457                     ; /* Nothing.  */
 458                   else if ((dependency_tracking & DEPEND_SET_FILE))
 459                     {
 460                       strcpy (buf + (dot - filename), ".d");
 461                       jcf_dependency_set_dep_file (buf);
 462                     }
 463                   else
 464                     jcf_dependency_set_dep_file ("-");
 465
 466                   free (buf);
 467                 }
 468             }
 469         }
 470     }
 471
 472   init_lex ();
 473
 474   return filename;
 475 }
 476
 477 void
 478 finish_parse ()
 479 {
 480   jcf_dependency_write ();
 481 }
 482
 483 /* Buffer used by lang_printable_name. */
 484 static char *decl_buf = NULL;
 485
 486 /* Allocated size of decl_buf. */
 487 static int decl_buflen = 0;
 488
 489 /* Length of used part of decl_buf;  position for next character. */
 490 static int decl_bufpos = 0;
 491
 492 /* Append the string STR to decl_buf.
 493    It length is given by LEN;  -1 means the string is nul-terminated. */
 494
 495 static void
 496 put_decl_string (str, len)
 497      const char *str;
 498      int len;
 499 {
 500   if (len < 0)
 501     len = strlen (str);
 502   if (decl_bufpos + len >= decl_buflen)
 503     {
 504       if (decl_buf == NULL)
 505         {
 506           decl_buflen = len + 100;
 507           decl_buf = (char *) xmalloc (decl_buflen);
 508         }
 509       else
 510         {
 511           decl_buflen *= 2;
 512           decl_buf = (char *) xrealloc (decl_buf, decl_buflen);
 513         }
 514     }
 515   strcpy (decl_buf + decl_bufpos, str);
 516   decl_bufpos += len;
 517 }
 518
 519 /* Append to decl_buf a printable name for NODE. */
 520
 521 static void
 522 put_decl_node (node)
 523      tree node;
 524 {
 525   int was_pointer = 0;
 526   if (TREE_CODE (node) == POINTER_TYPE)
 527     {
 528       node = TREE_TYPE (node);
 529       was_pointer = 1;
 530     }
 531   if (TREE_CODE_CLASS (TREE_CODE (node)) == 'd'
 532       && DECL_NAME (node) != NULL_TREE)
 533     {
 534       if (TREE_CODE (node) == FUNCTION_DECL)
 535         {
 536           /* We want to print the type the DECL belongs to. We don't do
 537              that when we handle constructors. */
 538           if (! DECL_CONSTRUCTOR_P (node)
 539               && ! DECL_ARTIFICIAL (node) && DECL_CONTEXT (node))
 540             {
 541               put_decl_node (TYPE_NAME (DECL_CONTEXT (node)));
 542               put_decl_string (".", 1);
 543             }
 544           if (! DECL_CONSTRUCTOR_P (node))
 545             put_decl_node (DECL_NAME (node));
 546           if (TREE_TYPE (node) != NULL_TREE)
 547             {
 548               int i = 0;
 549               tree args = TYPE_ARG_TYPES (TREE_TYPE (node));
 550               if (TREE_CODE (TREE_TYPE (node)) == METHOD_TYPE)
 551                 args = TREE_CHAIN (args);
 552               put_decl_string ("(", 1);
 553               for ( ; args != end_params_node;  args = TREE_CHAIN (args), i++)
 554                 {
 555                   if (i > 0)
 556                     put_decl_string (",", 1);
 557                   put_decl_node (TREE_VALUE (args));
 558                 }
 559               put_decl_string (")", 1);
 560             }
 561         }
 562       else
 563         put_decl_node (DECL_NAME (node));
 564     }
 565   else if (TREE_CODE_CLASS (TREE_CODE (node)) == 't'
 566       && TYPE_NAME (node) != NULL_TREE)
 567     {
 568       if (TREE_CODE (node) == RECORD_TYPE && TYPE_ARRAY_P (node))
 569         {
 570           put_decl_node (TYPE_ARRAY_ELEMENT (node));
 571           put_decl_string("[]", 2);
 572         }
 573       else if (node == promoted_byte_type_node)
 574         put_decl_string ("byte", 4);
 575       else if (node == promoted_short_type_node)
 576         put_decl_string ("short", 5);
 577       else if (node == promoted_char_type_node)
 578         put_decl_string ("char", 4);
 579       else if (node == promoted_boolean_type_node)
 580         put_decl_string ("boolean", 7);
 581       else if (node == void_type_node && was_pointer)
 582         put_decl_string ("null", 4);
 583       else
 584         put_decl_node (TYPE_NAME (node));
 585     }
 586   else if (TREE_CODE (node) == IDENTIFIER_NODE)
 587     put_decl_string (IDENTIFIER_POINTER (node), IDENTIFIER_LENGTH (node));
 588   else
 589     put_decl_string ("<unknown>", -1);
 590 }
 591
 592 /* Return a user-friendly name for DECL.
 593    The resulting string is only valid until the next call.
 594    The value of the hook decl_printable_name is this function,
 595    which is also called directly by lang_print_error. */
 596
 597 const char *
 598 lang_printable_name (decl, v)
 599      tree decl;
 600      int v  __attribute__ ((__unused__));
 601 {
 602   decl_bufpos = 0;
 603   put_decl_node (decl);
 604   put_decl_string ("", 1);
 605   return decl_buf;
 606 }
 607
 608 /* Does the same thing that lang_printable_name, but add a leading
 609    space to the DECL name string -- With Leading Space.  */
 610
 611 const char *
 612 lang_printable_name_wls (decl, v)
 613      tree decl;
 614      int v  __attribute__ ((__unused__));
 615 {
 616   decl_bufpos = 1;
 617   put_decl_node (decl);
 618   put_decl_string ("", 1);
 619   decl_buf [0] = ' ';
 620   return decl_buf;
 621 }
 622
 623 /* Print on stderr the current class and method context.  This function
 624    is the value of the hook print_error_function, called from toplev.c. */
 625
 626 static void
 627 lang_print_error (context, file)
 628      diagnostic_context *context __attribute__((__unused__));
 629      const char *file;
 630 {
 631   static tree last_error_function_context = NULL_TREE;
 632   static tree last_error_function = NULL;
 633   static int initialized_p;
 634
 635   /* Register LAST_ERROR_FUNCTION_CONTEXT and LAST_ERROR_FUNCTION with
 636      the garbage collector.  */
 637   if (!initialized_p)
 638     {
 639       ggc_add_tree_root (&last_error_function_context, 1);
 640       ggc_add_tree_root (&last_error_function, 1);
 641       initialized_p = 1;
 642     }
 643
 644   if (current_function_decl != NULL
 645       && DECL_CONTEXT (current_function_decl) != last_error_function_context)
 646     {
 647       if (file)
 648         fprintf (stderr, "%s: ", file);
 649
 650       last_error_function_context = DECL_CONTEXT (current_function_decl);
 651       fprintf (stderr, "In class `%s':\n",
 652                lang_printable_name (last_error_function_context, 0));
 653     }
 654   if (last_error_function != current_function_decl)
 655     {
 656       if (file)
 657         fprintf (stderr, "%s: ", file);
 658
 659       if (current_function_decl == NULL)
 660         fprintf (stderr, "At top level:\n");
 661       else
 662         {
 663           const char *name = lang_printable_name (current_function_decl, 2);
 664           fprintf (stderr, "In %s `%s':\n",
 665                    (DECL_CONSTRUCTOR_P (current_function_decl) ? "constructor"
 666                     : "method"),
 667                    name);
 668         }
 669
 670       last_error_function = current_function_decl;
 671     }
 672
 673 }
 674
 675 static void
 676 java_init ()
 677 {
 678 #if 0
 679   extern int flag_minimal_debug;
 680   flag_minimal_debug = 0;
 681 #endif
 682
 683   jcf_path_init ();
 684   jcf_path_seal (version_flag);
 685
 686   decl_printable_name = lang_printable_name;
 687   print_error_function = lang_print_error;
 688   lang_expand_expr = java_lang_expand_expr;
 689
 690   /* Append to Gcc tree node definition arrays */
 691
 692   memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
 693           java_tree_code_type,
 694           (int)LAST_JAVA_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
 695   memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
 696           java_tree_code_length,
 697           (LAST_JAVA_TREE_CODE -
 698            (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
 699   memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
 700           java_tree_code_name,
 701           (LAST_JAVA_TREE_CODE -
 702            (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));
 703
 704   using_eh_for_cleanups ();
 705 }
 706
 707 /* This doesn't do anything on purpose. It's used to satisfy the
 708    print_error_function hook we don't print error messages with bogus
 709    function prototypes.  */
 710
 711 static void
 712 java_dummy_print (c, s)
 713      diagnostic_context *c __attribute__ ((__unused__));
 714      const char *s __attribute__ ((__unused__));
 715 {
 716 }
 717
 718 /* Called to install the PRINT_ERROR_FUNCTION hook differently
 719    according to LEVEL. LEVEL is 1 during early parsing, when function
 720    prototypes aren't fully resolved. print_error_function is set so it
 721    doesn't print incomplete function prototypes. When LEVEL is 2,
 722    function prototypes are fully resolved and can be printed when
 723    reporting errors.  */
 724
 725 void lang_init_source (level)
 726      int level;
 727 {
 728   if (level == 1)
 729     print_error_function = java_dummy_print;
 730   else
 731     print_error_function = lang_print_error;
 732 }
 733
 734 static void
 735 java_init_options ()
 736 {
 737   flag_bounds_check = 1;
 738   flag_exceptions = 1;
 739   flag_non_call_exceptions = 1;
 740 }
 741
 742 const char *
 743 lang_identify ()
 744 {
 745   return "Java";
 746 }
 747
 748 /* Hooks for print_node.  */
 749
 750 void
 751 print_lang_decl (file, node, indent)
 752      FILE *file __attribute ((__unused__));
 753      tree node __attribute ((__unused__));
 754      int indent __attribute ((__unused__));
 755 {
 756 }
 757
 758 void
 759 print_lang_type (file, node, indent)
 760      FILE *file __attribute ((__unused__));
 761      tree node __attribute ((__unused__));
 762      int indent __attribute ((__unused__));
 763 {
 764 }
 765
 766 void
 767 print_lang_identifier (file, node, indent)
 768      FILE *file __attribute ((__unused__));
 769      tree node __attribute ((__unused__));
 770      int indent __attribute ((__unused__));
 771 {
 772 }
 773
 774 void
 775 print_lang_statistics ()
 776 {
 777 }
 778
 779 /* used by print-tree.c */
 780
 781 void
 782 lang_print_xnode (file, node, indent)
 783      FILE *file __attribute ((__unused__));
 784      tree node __attribute ((__unused__));
 785      int indent __attribute ((__unused__));
 786 {
 787 }
 788
 789 /* Return the typed-based alias set for T, which may be an expression
 790    or a type.  Return -1 if we don't do anything special.  */
 791
 792 HOST_WIDE_INT
 793 lang_get_alias_set (t)
 794      tree t ATTRIBUTE_UNUSED;
 795 {
 796   return -1;
 797 }