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