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 185   { "out-of-date", &flag_newer, 1 }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