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