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