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_PARSE_FILE
 225 #define LANG_HOOKS_PARSE_FILE java_parse_file
 226 #undef LANG_HOOKS_MARK_TREE
 227 #define LANG_HOOKS_MARK_TREE java_mark_tree
 228 #undef LANG_HOOKS_EXPAND_EXPR
 229 #define LANG_HOOKS_EXPAND_EXPR java_expand_expr
 230 #undef LANG_HOOKS_DUP_LANG_SPECIFIC_DECL
 231 #define LANG_HOOKS_DUP_LANG_SPECIFIC_DECL java_dup_lang_specific_decl
 232 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
 233 #define LANG_HOOKS_DECL_PRINTABLE_NAME lang_printable_name
 234
 235 /* Each front end provides its own.  */
 236 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
 237
 238 /* Process an option that can accept a `no-' form.
 239    Return 1 if option found, 0 otherwise.  */
 240 static int
 241 process_option_with_no (p, table, table_size)
 242      const char *p;
 243      const struct string_option *table;
 244      int table_size;
 245 {
 246   int j;
 247
 248   for (j = 0; j < table_size; j++)
 249     {
 250       if (!strcmp (p, table[j].string))
 251         {
 252           *table[j].variable = table[j].on_value;
 253           return 1;
 254         }
 255       if (p[0] == 'n' && p[1] == 'o' && p[2] == '-'
 256           && ! strcmp (p+3, table[j].string))
 257         {
 258           *table[j].variable = ! table[j].on_value;
 259           return 1;
 260         }
 261     }
 262
 263   return 0;
 264 }
 265
 266 /*
 267  * process java-specific compiler command-line options
 268  * return 0, but do not complain if the option is not recognised.
 269  */
 270 static int
 271 java_decode_option (argc, argv)
 272      int argc __attribute__ ((__unused__));
 273      char **argv;
 274 {
 275   char *p = argv[0];
 276
 277   jcf_path_init ();
 278
 279   if (strcmp (p, "-version") == 0)
 280     {
 281       version_flag = 1;
 282       /* We return 0 so that the caller can process this.  */
 283       return 0;
 284     }
 285
 286 #define CLARG "-fcompile-resource="
 287   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 288     {
 289       resource_name = p + sizeof (CLARG) - 1;
 290       return 1;
 291     }
 292 #undef CLARG
 293 #define CLARG "-fassume-compiled="
 294   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 295     {
 296       add_assume_compiled (p + sizeof (CLARG) - 1, 0);
 297       return 1;
 298     }
 299 #undef CLARG
 300 #define CLARG "-fno-assume-compiled="
 301   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 302     {
 303       add_assume_compiled (p + sizeof (CLARG) - 1, 1);
 304       return 1;
 305     }
 306 #undef CLARG
 307 #define CLARG "-fassume-compiled"
 308   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 309     {
 310       add_assume_compiled ("", 0);
 311       return 1;
 312     }
 313 #undef CLARG
 314 #define CLARG "-fno-assume-compiled"
 315   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 316     {
 317       add_assume_compiled ("", 1);
 318       return 1;
 319     }
 320 #undef CLARG
 321 #define CLARG "-fCLASSPATH="
 322   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 323     {
 324       jcf_path_classpath_arg (p + sizeof (CLARG) - 1);
 325       return 1;
 326     }
 327 #undef CLARG
 328 #define CLARG "-fclasspath="
 329   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 330     {
 331       jcf_path_classpath_arg (p + sizeof (CLARG) - 1);
 332       return 1;
 333     }
 334 #undef CLARG
 335 #define CLARG "-fbootclasspath="
 336   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 337     {
 338       jcf_path_bootclasspath_arg (p + sizeof (CLARG) - 1);
 339       return 1;
 340     }
 341 #undef CLARG
 342   else if (strncmp (p, "-I", 2) == 0)
 343     {
 344       jcf_path_include_arg (p + 2);
 345       return 1;
 346     }
 347
 348 #define ARG "-foutput-class-dir="
 349   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 350     {
 351       jcf_write_base_directory = p + sizeof (ARG) - 1;
 352       return 1;
 353     }
 354 #undef ARG
 355 #define ARG "-fencoding="
 356   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 357     {
 358       current_encoding = p + sizeof (ARG) - 1;
 359       return 1;
 360     }
 361 #undef ARG
 362
 363   if (p[0] == '-' && p[1] == 'f')
 364     {
 365       /* Some kind of -f option.
 366          P's value is the option sans `-f'.
 367          Search for it in the table of options.  */
 368       p += 2;
 369       if (process_option_with_no (p, lang_f_options,
 370                                   ARRAY_SIZE (lang_f_options)))
 371         return 1;
 372       return dump_switch_p (p);
 373     }
 374
 375   if (strcmp (p, "-Wall") == 0)
 376     {
 377       flag_wall = 1;
 378       flag_redundant = 1;
 379       flag_extraneous_semicolon = 1;
 380       /* When -Wall given, enable -Wunused.  We do this because the C
 381          compiler does it, and people expect it.  */
 382       set_Wunused (1);
 383       return 1;
 384     }
 385
 386   if (p[0] == '-' && p[1] == 'W')
 387     {
 388       /* Skip `-W' and see if we accept the option or its `no-' form.  */
 389       p += 2;
 390       return process_option_with_no (p, lang_W_options,
 391                                      ARRAY_SIZE (lang_W_options));
 392     }
 393
 394   if (strcmp (p, "-MD") == 0)
 395     {
 396       jcf_dependency_init (1);
 397       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 398       return 1;
 399     }
 400   else if (strcmp (p, "-MMD") == 0)
 401     {
 402       jcf_dependency_init (0);
 403       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 404       return 1;
 405     }
 406   else if (strcmp (p, "-M") == 0)
 407     {
 408       jcf_dependency_init (1);
 409       dependency_tracking |= DEPEND_ENABLE;
 410       return 1;
 411     }
 412   else if (strcmp (p, "-MM") == 0)
 413     {
 414       jcf_dependency_init (0);
 415       dependency_tracking |= DEPEND_ENABLE;
 416       return 1;
 417     }
 418   else if (strcmp (p, "-MP") == 0)
 419     {
 420       jcf_dependency_print_dummies ();
 421       return 1;
 422     }
 423   else if (strcmp (p, "-MT") == 0)
 424     {
 425       jcf_dependency_set_target (argv[1]);
 426       dependency_tracking |= DEPEND_TARGET_SET;
 427       return 2;
 428     }
 429   else if (strcmp (p, "-MF") == 0)
 430     {
 431       jcf_dependency_set_dep_file (argv[1]);
 432       dependency_tracking |= DEPEND_FILE_ALREADY_SET;
 433       return 2;
 434     }
 435
 436   return 0;
 437 }
 438
 439 /* Global open file.  */
 440 FILE *finput;
 441
 442 static const char *
 443 java_init (filename)
 444      const char *filename;
 445 {
 446 #if 0
 447   extern int flag_minimal_debug;
 448   flag_minimal_debug = 0;
 449 #endif
 450
 451   /* Open input file.  */
 452
 453   if (filename == 0 || !strcmp (filename, "-"))
 454     {
 455       finput = stdin;
 456       filename = "stdin";
 457
 458       if (dependency_tracking)
 459         error ("can't do dependency tracking with input from stdin");
 460     }
 461   else
 462     {
 463       if (dependency_tracking)
 464         {
 465           char *dot;
 466
 467           /* If the target is set and the output filename is set, then
 468              there's no processing to do here.  Otherwise we must
 469              compute one or the other.  */
 470           if (! ((dependency_tracking & DEPEND_TARGET_SET)
 471                  && (dependency_tracking & DEPEND_FILE_ALREADY_SET)))
 472             {
 473               dot = strrchr (filename, '.');
 474               if (dot == NULL)
 475                 error ("couldn't determine target name for dependency tracking");
 476               else
 477                 {
 478                   char *buf = (char *) xmalloc (dot - filename +
 479                                                 3 + sizeof (TARGET_OBJECT_SUFFIX));
 480                   strncpy (buf, filename, dot - filename);
 481
 482                   /* If emitting class files, we might have multiple
 483                      targets.  The class generation code takes care of
 484                      registering them.  Otherwise we compute the
 485                      target name here.  */
 486                   if ((dependency_tracking & DEPEND_TARGET_SET))
 487                     ; /* Nothing.  */
 488                   else if (flag_emit_class_files)
 489                     jcf_dependency_set_target (NULL);
 490                   else
 491                     {
 492                       strcpy (buf + (dot - filename), TARGET_OBJECT_SUFFIX);
 493                       jcf_dependency_set_target (buf);
 494                     }
 495
 496                   if ((dependency_tracking & DEPEND_FILE_ALREADY_SET))
 497                     ; /* Nothing.  */
 498                   else if ((dependency_tracking & DEPEND_SET_FILE))
 499                     {
 500                       strcpy (buf + (dot - filename), ".d");
 501                       jcf_dependency_set_dep_file (buf);
 502                     }
 503                   else
 504                     jcf_dependency_set_dep_file ("-");
 505
 506                   free (buf);
 507                 }
 508             }
 509         }
 510     }
 511
 512   jcf_path_init ();
 513   jcf_path_seal (version_flag);
 514
 515   print_error_function = lang_print_error;
 516
 517   java_init_decl_processing ();
 518
 519   using_eh_for_cleanups ();
 520
 521   return filename;
 522 }
 523
 524 static void
 525 java_finish ()
 526 {
 527   jcf_dependency_write ();
 528 }
 529
 530 /* Buffer used by lang_printable_name. */
 531 static char *decl_buf = NULL;
 532
 533 /* Allocated size of decl_buf. */
 534 static int decl_buflen = 0;
 535
 536 /* Length of used part of decl_buf;  position for next character. */
 537 static int decl_bufpos = 0;
 538
 539 /* Append the string STR to decl_buf.
 540    It length is given by LEN;  -1 means the string is nul-terminated. */
 541
 542 static void
 543 put_decl_string (str, len)
 544      const char *str;
 545      int len;
 546 {
 547   if (len < 0)
 548     len = strlen (str);
 549   if (decl_bufpos + len >= decl_buflen)
 550     {
 551       if (decl_buf == NULL)
 552         {
 553           decl_buflen = len + 100;
 554           decl_buf = (char *) xmalloc (decl_buflen);
 555         }
 556       else
 557         {
 558           decl_buflen *= 2;
 559           decl_buf = (char *) xrealloc (decl_buf, decl_buflen);
 560         }
 561     }
 562   strcpy (decl_buf + decl_bufpos, str);
 563   decl_bufpos += len;
 564 }
 565
 566 /* Append to decl_buf a printable name for NODE. */
 567
 568 static void
 569 put_decl_node (node)
 570      tree node;
 571 {
 572   int was_pointer = 0;
 573   if (TREE_CODE (node) == POINTER_TYPE)
 574     {
 575       node = TREE_TYPE (node);
 576       was_pointer = 1;
 577     }
 578   if (TREE_CODE_CLASS (TREE_CODE (node)) == 'd'
 579       && DECL_NAME (node) != NULL_TREE)
 580     {
 581       if (TREE_CODE (node) == FUNCTION_DECL)
 582         {
 583           /* We want to print the type the DECL belongs to. We don't do
 584              that when we handle constructors. */
 585           if (! DECL_CONSTRUCTOR_P (node)
 586               && ! DECL_ARTIFICIAL (node) && DECL_CONTEXT (node))
 587             {
 588               put_decl_node (TYPE_NAME (DECL_CONTEXT (node)));
 589               put_decl_string (".", 1);
 590             }
 591           if (! DECL_CONSTRUCTOR_P (node))
 592             put_decl_node (DECL_NAME (node));
 593           if (TREE_TYPE (node) != NULL_TREE)
 594             {
 595               int i = 0;
 596               tree args = TYPE_ARG_TYPES (TREE_TYPE (node));
 597               if (TREE_CODE (TREE_TYPE (node)) == METHOD_TYPE)
 598                 args = TREE_CHAIN (args);
 599               put_decl_string ("(", 1);
 600               for ( ; args != end_params_node;  args = TREE_CHAIN (args), i++)
 601                 {
 602                   if (i > 0)
 603                     put_decl_string (",", 1);
 604                   put_decl_node (TREE_VALUE (args));
 605                 }
 606               put_decl_string (")", 1);
 607             }
 608         }
 609       else
 610         put_decl_node (DECL_NAME (node));
 611     }
 612   else if (TREE_CODE_CLASS (TREE_CODE (node)) == 't'
 613       && TYPE_NAME (node) != NULL_TREE)
 614     {
 615       if (TREE_CODE (node) == RECORD_TYPE && TYPE_ARRAY_P (node))
 616         {
 617           put_decl_node (TYPE_ARRAY_ELEMENT (node));
 618           put_decl_string("[]", 2);
 619         }
 620       else if (node == promoted_byte_type_node)
 621         put_decl_string ("byte", 4);
 622       else if (node == promoted_short_type_node)
 623         put_decl_string ("short", 5);
 624       else if (node == promoted_char_type_node)
 625         put_decl_string ("char", 4);
 626       else if (node == promoted_boolean_type_node)
 627         put_decl_string ("boolean", 7);
 628       else if (node == void_type_node && was_pointer)
 629         put_decl_string ("null", 4);
 630       else
 631         put_decl_node (TYPE_NAME (node));
 632     }
 633   else if (TREE_CODE (node) == IDENTIFIER_NODE)
 634     put_decl_string (IDENTIFIER_POINTER (node), IDENTIFIER_LENGTH (node));
 635   else
 636     put_decl_string ("<unknown>", -1);
 637 }
 638
 639 /* Return a user-friendly name for DECL.
 640    The resulting string is only valid until the next call.
 641    The value of the hook decl_printable_name is this function,
 642    which is also called directly by lang_print_error. */
 643
 644 const char *
 645 lang_printable_name (decl, v)
 646      tree decl;
 647      int v  __attribute__ ((__unused__));
 648 {
 649   decl_bufpos = 0;
 650   put_decl_node (decl);
 651   put_decl_string ("", 1);
 652   return decl_buf;
 653 }
 654
 655 /* Does the same thing that lang_printable_name, but add a leading
 656    space to the DECL name string -- With Leading Space.  */
 657
 658 const char *
 659 lang_printable_name_wls (decl, v)
 660      tree decl;
 661      int v  __attribute__ ((__unused__));
 662 {
 663   decl_bufpos = 1;
 664   put_decl_node (decl);
 665   put_decl_string ("", 1);
 666   decl_buf [0] = ' ';
 667   return decl_buf;
 668 }
 669
 670 /* Print on stderr the current class and method context.  This function
 671    is the value of the hook print_error_function, called from toplev.c. */
 672
 673 static void
 674 lang_print_error (context, file)
 675      diagnostic_context *context __attribute__((__unused__));
 676      const char *file;
 677 {
 678   static tree last_error_function_context = NULL_TREE;
 679   static tree last_error_function = NULL;
 680   static int initialized_p;
 681
 682   /* Register LAST_ERROR_FUNCTION_CONTEXT and LAST_ERROR_FUNCTION with
 683      the garbage collector.  */
 684   if (!initialized_p)
 685     {
 686       ggc_add_tree_root (&last_error_function_context, 1);
 687       ggc_add_tree_root (&last_error_function, 1);
 688       initialized_p = 1;
 689     }
 690
 691   if (current_function_decl != NULL
 692       && DECL_CONTEXT (current_function_decl) != last_error_function_context)
 693     {
 694       if (file)
 695         fprintf (stderr, "%s: ", file);
 696
 697       last_error_function_context = DECL_CONTEXT (current_function_decl);
 698       fprintf (stderr, "In class `%s':\n",
 699                lang_printable_name (last_error_function_context, 0));
 700     }
 701   if (last_error_function != current_function_decl)
 702     {
 703       if (file)
 704         fprintf (stderr, "%s: ", file);
 705
 706       if (current_function_decl == NULL)
 707         fprintf (stderr, "At top level:\n");
 708       else
 709         {
 710           const char *name = lang_printable_name (current_function_decl, 2);
 711           fprintf (stderr, "In %s `%s':\n",
 712                    (DECL_CONSTRUCTOR_P (current_function_decl) ? "constructor"
 713                     : "method"),
 714                    name);
 715         }
 716
 717       last_error_function = current_function_decl;
 718     }
 719
 720 }
 721
 722 /* This doesn't do anything on purpose. It's used to satisfy the
 723    print_error_function hook we don't print error messages with bogus
 724    function prototypes.  */
 725
 726 static void
 727 java_dummy_print (c, s)
 728      diagnostic_context *c __attribute__ ((__unused__));
 729      const char *s __attribute__ ((__unused__));
 730 {
 731 }
 732
 733 /* Called to install the PRINT_ERROR_FUNCTION hook differently
 734    according to LEVEL. LEVEL is 1 during early parsing, when function
 735    prototypes aren't fully resolved. print_error_function is set so it
 736    doesn't print incomplete function prototypes. When LEVEL is 2,
 737    function prototypes are fully resolved and can be printed when
 738    reporting errors.  */
 739
 740 void lang_init_source (level)
 741      int level;
 742 {
 743   if (level == 1)
 744     print_error_function = java_dummy_print;
 745   else
 746     print_error_function = lang_print_error;
 747 }
 748
 749 static void
 750 java_init_options ()
 751 {
 752   flag_bounds_check = 1;
 753   flag_exceptions = 1;
 754   flag_non_call_exceptions = 1;
 755
 756   /* In Java floating point operations never trap.  */
 757   flag_trapping_math = 0;
 758 }