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_MARK_ADDRESSABLE
 233 #define LANG_HOOKS_MARK_ADDRESSABLE java_mark_addressable
 234 #undef LANG_HOOKS_EXPAND_EXPR
 235 #define LANG_HOOKS_EXPAND_EXPR java_expand_expr
 236 #undef LANG_HOOKS_TRUTHVALUE_CONVERSION
 237 #define LANG_HOOKS_TRUTHVALUE_CONVERSION java_truthvalue_conversion
 238 #undef LANG_HOOKS_DUP_LANG_SPECIFIC_DECL
 239 #define LANG_HOOKS_DUP_LANG_SPECIFIC_DECL java_dup_lang_specific_decl
 240 #undef LANG_HOOKS_DECL_PRINTABLE_NAME
 241 #define LANG_HOOKS_DECL_PRINTABLE_NAME lang_printable_name
 242 #undef LANG_HOOKS_PRINT_ERROR_FUNCTION
 243 #define LANG_HOOKS_PRINT_ERROR_FUNCTION java_print_error_function
 244
 245 #undef LANG_HOOKS_TYPE_FOR_MODE
 246 #define LANG_HOOKS_TYPE_FOR_MODE java_type_for_mode
 247 #undef LANG_HOOKS_TYPE_FOR_SIZE
 248 #define LANG_HOOKS_TYPE_FOR_SIZE java_type_for_size
 249 #undef LANG_HOOKS_SIGNED_TYPE
 250 #define LANG_HOOKS_SIGNED_TYPE java_signed_type
 251 #undef LANG_HOOKS_UNSIGNED_TYPE
 252 #define LANG_HOOKS_UNSIGNED_TYPE java_unsigned_type
 253 #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE
 254 #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE java_signed_or_unsigned_type
 255
 256 /* Each front end provides its own.  */
 257 const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
 258
 259 /* Process an option that can accept a `no-' form.
 260    Return 1 if option found, 0 otherwise.  */
 261 static int
 262 process_option_with_no (p, table, table_size)
 263      const char *p;
 264      const struct string_option *table;
 265      int table_size;
 266 {
 267   int j;
 268
 269   for (j = 0; j < table_size; j++)
 270     {
 271       if (!strcmp (p, table[j].string))
 272         {
 273           *table[j].variable = table[j].on_value;
 274           return 1;
 275         }
 276       if (p[0] == 'n' && p[1] == 'o' && p[2] == '-'
 277           && ! strcmp (p+3, table[j].string))
 278         {
 279           *table[j].variable = ! table[j].on_value;
 280           return 1;
 281         }
 282     }
 283
 284   return 0;
 285 }
 286
 287 /*
 288  * process java-specific compiler command-line options
 289  * return 0, but do not complain if the option is not recognised.
 290  */
 291 static int
 292 java_decode_option (argc, argv)
 293      int argc __attribute__ ((__unused__));
 294      char **argv;
 295 {
 296   char *p = argv[0];
 297
 298   jcf_path_init ();
 299
 300   if (strcmp (p, "-version") == 0)
 301     {
 302       version_flag = 1;
 303       /* We return 0 so that the caller can process this.  */
 304       return 0;
 305     }
 306
 307 #define CLARG "-fcompile-resource="
 308   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 309     {
 310       resource_name = p + sizeof (CLARG) - 1;
 311       return 1;
 312     }
 313 #undef CLARG
 314 #define CLARG "-fassume-compiled="
 315   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 316     {
 317       add_assume_compiled (p + sizeof (CLARG) - 1, 0);
 318       return 1;
 319     }
 320 #undef CLARG
 321 #define CLARG "-fno-assume-compiled="
 322   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 323     {
 324       add_assume_compiled (p + sizeof (CLARG) - 1, 1);
 325       return 1;
 326     }
 327 #undef CLARG
 328 #define CLARG "-fassume-compiled"
 329   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 330     {
 331       add_assume_compiled ("", 0);
 332       return 1;
 333     }
 334 #undef CLARG
 335 #define CLARG "-fno-assume-compiled"
 336   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 337     {
 338       add_assume_compiled ("", 1);
 339       return 1;
 340     }
 341 #undef CLARG
 342 #define CLARG "-fCLASSPATH="
 343   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 344     {
 345       jcf_path_classpath_arg (p + sizeof (CLARG) - 1);
 346       return 1;
 347     }
 348 #undef CLARG
 349 #define CLARG "-fclasspath="
 350   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 351     {
 352       jcf_path_classpath_arg (p + sizeof (CLARG) - 1);
 353       return 1;
 354     }
 355 #undef CLARG
 356 #define CLARG "-fbootclasspath="
 357   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 358     {
 359       jcf_path_bootclasspath_arg (p + sizeof (CLARG) - 1);
 360       return 1;
 361     }
 362 #undef CLARG
 363 #define CLARG "-fextdirs="
 364   if (strncmp (p, CLARG, sizeof (CLARG) - 1) == 0)
 365     {
 366       jcf_path_extdirs_arg (p + sizeof (CLARG) - 1);
 367       return 1;
 368     }
 369 #undef CLARG
 370   else if (strncmp (p, "-I", 2) == 0)
 371     {
 372       jcf_path_include_arg (p + 2);
 373       return 1;
 374     }
 375
 376 #define ARG "-foutput-class-dir="
 377   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 378     {
 379       jcf_write_base_directory = p + sizeof (ARG) - 1;
 380       return 1;
 381     }
 382 #undef ARG
 383 #define ARG "-fencoding="
 384   if (strncmp (p, ARG, sizeof (ARG) - 1) == 0)
 385     {
 386       current_encoding = p + sizeof (ARG) - 1;
 387       return 1;
 388     }
 389 #undef ARG
 390
 391   if (p[0] == '-' && p[1] == 'f')
 392     {
 393       /* Some kind of -f option.
 394          P's value is the option sans `-f'.
 395          Search for it in the table of options.  */
 396       p += 2;
 397       if (process_option_with_no (p, lang_f_options,
 398                                   ARRAY_SIZE (lang_f_options)))
 399         return 1;
 400       return dump_switch_p (p);
 401     }
 402
 403   if (strcmp (p, "-Wall") == 0)
 404     {
 405       flag_wall = 1;
 406       flag_redundant = 1;
 407       flag_extraneous_semicolon = 1;
 408       /* When -Wall given, enable -Wunused.  We do this because the C
 409          compiler does it, and people expect it.  */
 410       set_Wunused (1);
 411       return 1;
 412     }
 413
 414   if (p[0] == '-' && p[1] == 'W')
 415     {
 416       /* Skip `-W' and see if we accept the option or its `no-' form.  */
 417       p += 2;
 418       return process_option_with_no (p, lang_W_options,
 419                                      ARRAY_SIZE (lang_W_options));
 420     }
 421
 422   if (strcmp (p, "-MD") == 0)
 423     {
 424       jcf_dependency_init (1);
 425       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 426       return 1;
 427     }
 428   else if (strcmp (p, "-MMD") == 0)
 429     {
 430       jcf_dependency_init (0);
 431       dependency_tracking |= DEPEND_SET_FILE | DEPEND_ENABLE;
 432       return 1;
 433     }
 434   else if (strcmp (p, "-M") == 0)
 435     {
 436       jcf_dependency_init (1);
 437       dependency_tracking |= DEPEND_ENABLE;
 438       return 1;
 439     }
 440   else if (strcmp (p, "-MM") == 0)
 441     {
 442       jcf_dependency_init (0);
 443       dependency_tracking |= DEPEND_ENABLE;
 444       return 1;
 445     }
 446   else if (strcmp (p, "-MP") == 0)
 447     {
 448       jcf_dependency_print_dummies ();
 449       return 1;
 450     }
 451   else if (strcmp (p, "-MT") == 0)
 452     {
 453       jcf_dependency_set_target (argv[1]);
 454       dependency_tracking |= DEPEND_TARGET_SET;
 455       return 2;
 456     }
 457   else if (strcmp (p, "-MF") == 0)
 458     {
 459       jcf_dependency_set_dep_file (argv[1]);
 460       dependency_tracking |= DEPEND_FILE_ALREADY_SET;
 461       return 2;
 462     }
 463
 464   return 0;
 465 }
 466
 467 /* Global open file.  */
 468 FILE *finput;
 469
 470 static const char *
 471 java_init (filename)
 472      const char *filename;
 473 {
 474 #if 0
 475   extern int flag_minimal_debug;
 476   flag_minimal_debug = 0;
 477 #endif
 478
 479   /* Open input file.  */
 480
 481   if (filename == 0 || !strcmp (filename, "-"))
 482     {
 483       finput = stdin;
 484       filename = "stdin";
 485
 486       if (dependency_tracking)
 487         error ("can't do dependency tracking with input from stdin");
 488     }
 489   else
 490     {
 491       if (dependency_tracking)
 492         {
 493           char *dot;
 494
 495           /* If the target is set and the output filename is set, then
 496              there's no processing to do here.  Otherwise we must
 497              compute one or the other.  */
 498           if (! ((dependency_tracking & DEPEND_TARGET_SET)
 499                  && (dependency_tracking & DEPEND_FILE_ALREADY_SET)))
 500             {
 501               dot = strrchr (filename, '.');
 502               if (dot == NULL)
 503                 error ("couldn't determine target name for dependency tracking");
 504               else
 505                 {
 506                   char *buf = (char *) xmalloc (dot - filename +
 507                                                 3 + sizeof (TARGET_OBJECT_SUFFIX));
 508                   strncpy (buf, filename, dot - filename);
 509
 510                   /* If emitting class files, we might have multiple
 511                      targets.  The class generation code takes care of
 512                      registering them.  Otherwise we compute the
 513                      target name here.  */
 514                   if ((dependency_tracking & DEPEND_TARGET_SET))
 515                     ; /* Nothing.  */
 516                   else if (flag_emit_class_files)
 517                     jcf_dependency_set_target (NULL);
 518                   else
 519                     {
 520                       strcpy (buf + (dot - filename), TARGET_OBJECT_SUFFIX);
 521                       jcf_dependency_set_target (buf);
 522                     }
 523
 524                   if ((dependency_tracking & DEPEND_FILE_ALREADY_SET))
 525                     ; /* Nothing.  */
 526                   else if ((dependency_tracking & DEPEND_SET_FILE))
 527                     {
 528                       strcpy (buf + (dot - filename), ".d");
 529                       jcf_dependency_set_dep_file (buf);
 530                     }
 531                   else
 532                     jcf_dependency_set_dep_file ("-");
 533
 534                   free (buf);
 535                 }
 536             }
 537         }
 538     }
 539
 540   jcf_path_init ();
 541   jcf_path_seal (version_flag);
 542
 543   java_init_decl_processing ();
 544
 545   using_eh_for_cleanups ();
 546
 547   return filename;
 548 }
 549
 550 static void
 551 java_finish ()
 552 {
 553   jcf_dependency_write ();
 554 }
 555
 556 /* Buffer used by lang_printable_name. */
 557 static char *decl_buf = NULL;
 558
 559 /* Allocated size of decl_buf. */
 560 static int decl_buflen = 0;
 561
 562 /* Length of used part of decl_buf;  position for next character. */
 563 static int decl_bufpos = 0;
 564
 565 /* Append the string STR to decl_buf.
 566    It length is given by LEN;  -1 means the string is nul-terminated. */
 567
 568 static void
 569 put_decl_string (str, len)
 570      const char *str;
 571      int len;
 572 {
 573   if (len < 0)
 574     len = strlen (str);
 575   if (decl_bufpos + len >= decl_buflen)
 576     {
 577       if (decl_buf == NULL)
 578         {
 579           decl_buflen = len + 100;
 580           decl_buf = (char *) xmalloc (decl_buflen);
 581         }
 582       else
 583         {
 584           decl_buflen *= 2;
 585           decl_buf = (char *) xrealloc (decl_buf, decl_buflen);
 586         }
 587     }
 588   strcpy (decl_buf + decl_bufpos, str);
 589   decl_bufpos += len;
 590 }
 591
 592 /* Append to decl_buf a printable name for NODE. */
 593
 594 static void
 595 put_decl_node (node)
 596      tree node;
 597 {
 598   int was_pointer = 0;
 599   if (TREE_CODE (node) == POINTER_TYPE)
 600     {
 601       node = TREE_TYPE (node);
 602       was_pointer = 1;
 603     }
 604   if (TREE_CODE_CLASS (TREE_CODE (node)) == 'd'
 605       && DECL_NAME (node) != NULL_TREE)
 606     {
 607       if (TREE_CODE (node) == FUNCTION_DECL)
 608         {
 609           /* We want to print the type the DECL belongs to. We don't do
 610              that when we handle constructors. */
 611           if (! DECL_CONSTRUCTOR_P (node)
 612               && ! DECL_ARTIFICIAL (node) && DECL_CONTEXT (node))
 613             {
 614               put_decl_node (TYPE_NAME (DECL_CONTEXT (node)));
 615               put_decl_string (".", 1);
 616             }
 617           if (! DECL_CONSTRUCTOR_P (node))
 618             put_decl_node (DECL_NAME (node));
 619           if (TREE_TYPE (node) != NULL_TREE)
 620             {
 621               int i = 0;
 622               tree args = TYPE_ARG_TYPES (TREE_TYPE (node));
 623               if (TREE_CODE (TREE_TYPE (node)) == METHOD_TYPE)
 624                 args = TREE_CHAIN (args);
 625               put_decl_string ("(", 1);
 626               for ( ; args != end_params_node;  args = TREE_CHAIN (args), i++)
 627                 {
 628                   if (i > 0)
 629                     put_decl_string (",", 1);
 630                   put_decl_node (TREE_VALUE (args));
 631                 }
 632               put_decl_string (")", 1);
 633             }
 634         }
 635       else
 636         put_decl_node (DECL_NAME (node));
 637     }
 638   else if (TREE_CODE_CLASS (TREE_CODE (node)) == 't'
 639       && TYPE_NAME (node) != NULL_TREE)
 640     {
 641       if (TREE_CODE (node) == RECORD_TYPE && TYPE_ARRAY_P (node))
 642         {
 643           put_decl_node (TYPE_ARRAY_ELEMENT (node));
 644           put_decl_string("[]", 2);
 645         }
 646       else if (node == promoted_byte_type_node)
 647         put_decl_string ("byte", 4);
 648       else if (node == promoted_short_type_node)
 649         put_decl_string ("short", 5);
 650       else if (node == promoted_char_type_node)
 651         put_decl_string ("char", 4);
 652       else if (node == promoted_boolean_type_node)
 653         put_decl_string ("boolean", 7);
 654       else if (node == void_type_node && was_pointer)
 655         put_decl_string ("null", 4);
 656       else
 657         put_decl_node (TYPE_NAME (node));
 658     }
 659   else if (TREE_CODE (node) == IDENTIFIER_NODE)
 660     put_decl_string (IDENTIFIER_POINTER (node), IDENTIFIER_LENGTH (node));
 661   else
 662     put_decl_string ("<unknown>", -1);
 663 }
 664
 665 /* Return a user-friendly name for DECL.
 666    The resulting string is only valid until the next call.
 667    The value of the hook decl_printable_name is this function,
 668    which is also called directly by java_print_error_function. */
 669
 670 const char *
 671 lang_printable_name (decl, v)
 672      tree decl;
 673      int v  __attribute__ ((__unused__));
 674 {
 675   decl_bufpos = 0;
 676   put_decl_node (decl);
 677   put_decl_string ("", 1);
 678   return decl_buf;
 679 }
 680
 681 /* Does the same thing that lang_printable_name, but add a leading
 682    space to the DECL name string -- With Leading Space.  */
 683
 684 const char *
 685 lang_printable_name_wls (decl, v)
 686      tree decl;
 687      int v  __attribute__ ((__unused__));
 688 {
 689   decl_bufpos = 1;
 690   put_decl_node (decl);
 691   put_decl_string ("", 1);
 692   decl_buf [0] = ' ';
 693   return decl_buf;
 694 }
 695
 696 /* Print on stderr the current class and method context.  This function
 697    is the value of the hook print_error_function. */
 698
 699 static void
 700 java_print_error_function (context, file)
 701      diagnostic_context *context __attribute__((__unused__));
 702      const char *file;
 703 {
 704   static tree last_error_function_context = NULL_TREE;
 705   static tree last_error_function = NULL;
 706   static int initialized_p;
 707
 708   /* Register LAST_ERROR_FUNCTION_CONTEXT and LAST_ERROR_FUNCTION with
 709      the garbage collector.  */
 710   if (!initialized_p)
 711     {
 712       ggc_add_tree_root (&last_error_function_context, 1);
 713       ggc_add_tree_root (&last_error_function, 1);
 714       initialized_p = 1;
 715     }
 716
 717   /* Don't print error messages with bogus function prototypes.  */
 718   if (inhibit_error_function_printing)
 719     return;
 720
 721   if (current_function_decl != NULL
 722       && DECL_CONTEXT (current_function_decl) != last_error_function_context)
 723     {
 724       if (file)
 725         fprintf (stderr, "%s: ", file);
 726
 727       last_error_function_context = DECL_CONTEXT (current_function_decl);
 728       fprintf (stderr, "In class `%s':\n",
 729                lang_printable_name (last_error_function_context, 0));
 730     }
 731   if (last_error_function != current_function_decl)
 732     {
 733       if (file)
 734         fprintf (stderr, "%s: ", file);
 735
 736       if (current_function_decl == NULL)
 737         fprintf (stderr, "At top level:\n");
 738       else
 739         {
 740           const char *name = lang_printable_name (current_function_decl, 2);
 741           fprintf (stderr, "In %s `%s':\n",
 742                    (DECL_CONSTRUCTOR_P (current_function_decl) ? "constructor"
 743                     : "method"),
 744                    name);
 745         }
 746
 747       last_error_function = current_function_decl;
 748     }
 749
 750 }
 751
 752 /* Called to install the PRINT_ERROR_FUNCTION hook differently
 753    according to LEVEL. LEVEL is 1 during early parsing, when function
 754    prototypes aren't fully resolved. java_print_error_function is set
 755    so it doesn't print incomplete function prototypes. When LEVEL is
 756    2, function prototypes are fully resolved and can be printed when
 757    reporting errors.  */
 758
 759 void lang_init_source (level)
 760      int level;
 761 {
 762   inhibit_error_function_printing = (level == 1);
 763 }
 764
 765 static void
 766 java_init_options ()
 767 {
 768   flag_bounds_check = 1;
 769   flag_exceptions = 1;
 770   flag_non_call_exceptions = 1;
 771
 772   /* In Java floating point operations never trap.  */
 773   flag_trapping_math = 0;
 774 }