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