gcc/java/jcf-reader.c

   1 /* This file read a Java(TM) .class file.
   2    It is not stand-alone:  It depends on tons of macros, and the
   3    intent is you #include this file after you've defined the macros.
   4
   5    Copyright (C) 1996, 1997, 1998, 1999, 2000  Free Software Foundation, Inc.
   6
   7 This program 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 This program 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 #include "jcf.h"
  27 #include "zipfile.h"
  28
  29 static int get_attribute PARAMS ((JCF *));
  30 static int jcf_parse_preamble PARAMS ((JCF *));
  31 static int jcf_parse_constant_pool PARAMS ((JCF *));
  32 static void jcf_parse_class PARAMS ((JCF *));
  33 static int jcf_parse_fields PARAMS ((JCF *));
  34 static int jcf_parse_one_method PARAMS ((JCF *));
  35 static int jcf_parse_methods PARAMS ((JCF *));
  36 static int jcf_parse_final_attributes PARAMS ((JCF *));
  37 #ifdef NEED_PEEK_ATTRIBUTE
  38 static int peek_attribute PARAMS ((JCF *, int, const char *, int));
  39 #endif
  40 #ifdef NEED_SKIP_ATTRIBUTE
  41 static void skip_attribute PARAMS ((JCF *, int));
  42 #endif
  43
  44 /* Go through all available attribute (ATTRIBUTE_NUMER) and try to
  45    identify PEEKED_NAME.  Return 1 if PEEKED_NAME was found, 0
  46    otherwise. JCF is restored to its initial position before
  47    returning.  */
  48
  49 #ifdef NEED_PEEK_ATTRIBUTE      /* Not everyone uses this function */
  50 static int
  51 peek_attribute (jcf, attribute_number, peeked_name, peeked_name_length)
  52       JCF *jcf;
  53       int attribute_number;
  54       const char *peeked_name;
  55       int peeked_name_length;
  56 {
  57   int to_return = 0;
  58   long absolute_offset = (long)JCF_TELL (jcf);
  59   int i;
  60
  61   for (i = 0; !to_return && i < attribute_number; i++)
  62     {
  63       uint16 attribute_name = (JCF_FILL (jcf, 6), JCF_readu2 (jcf));
  64       uint32 attribute_length = JCF_readu4 (jcf);
  65       int name_length;
  66       const unsigned char *name_data;
  67
  68       JCF_FILL (jcf, (long) attribute_length);
  69       if (attribute_name <= 0 || attribute_name >= JPOOL_SIZE(jcf)
  70           || JPOOL_TAG (jcf, attribute_name) != CONSTANT_Utf8)
  71         continue;
  72
  73       name_length = JPOOL_UTF_LENGTH (jcf, attribute_name);
  74       name_data = JPOOL_UTF_DATA (jcf, attribute_name);
  75
  76       if (name_length == peeked_name_length
  77           && ! memcmp (name_data, peeked_name, peeked_name_length))
  78         {
  79           to_return = 1;
  80           break;
  81         }
  82
  83       JCF_SKIP (jcf, attribute_length);
  84     }
  85
  86   JCF_SEEK (jcf, absolute_offset);
  87   return to_return;
  88 }
  89 #endif
  90
  91 #ifdef NEED_SKIP_ATTRIBUTE      /* Not everyone uses this function */
  92 static void
  93 skip_attribute (jcf, number_of_attribute)
  94      JCF *jcf;
  95      int number_of_attribute;
  96 {
  97   while (number_of_attribute--)
  98     {
  99       JCF_FILL (jcf, 6);
 100       (void) JCF_readu2 (jcf);
 101       JCF_SKIP (jcf, JCF_readu4 (jcf));
 102     }
 103 }
 104 #endif
 105
 106 static int
 107 DEFUN(get_attribute, (jcf),
 108       JCF *jcf)
 109 {
 110   uint16 attribute_name = (JCF_FILL (jcf, 6), JCF_readu2 (jcf));
 111   uint32 attribute_length = JCF_readu4 (jcf);
 112   uint32 start_pos = JCF_TELL(jcf);
 113   int name_length;
 114   const unsigned char *name_data;
 115   JCF_FILL (jcf, (long) attribute_length);
 116   if (attribute_name <= 0 || attribute_name >= JPOOL_SIZE(jcf))
 117     return -2;
 118   if (JPOOL_TAG (jcf, attribute_name) != CONSTANT_Utf8)
 119     return -2;
 120   name_length = JPOOL_UTF_LENGTH (jcf, attribute_name);
 121   name_data = JPOOL_UTF_DATA (jcf, attribute_name);
 122
 123 #define MATCH_ATTRIBUTE(S) \
 124   (name_length == sizeof (S)-1 && memcmp (name_data, S, sizeof (S)-1) == 0)
 125
 126 #ifdef IGNORE_ATTRIBUTE
 127    if (IGNORE_ATTRIBUTE (jcf, attribute_name, attribute_length))
 128      {
 129        JCF_SKIP (jcf, attribute_length);
 130      }
 131    else
 132 #endif
 133 #ifdef HANDLE_SOURCEFILE
 134   if (MATCH_ATTRIBUTE ("SourceFile"))
 135     {
 136       uint16 sourcefile_index = JCF_readu2 (jcf);
 137       HANDLE_SOURCEFILE(sourcefile_index);
 138     }
 139   else
 140 #endif
 141 #ifdef HANDLE_CONSTANTVALUE
 142   if (MATCH_ATTRIBUTE ("ConstantValue"))
 143     {
 144       uint16 constantvalue_index = JCF_readu2 (jcf);
 145       if (constantvalue_index <= 0 || constantvalue_index >= JPOOL_SIZE(jcf))
 146         return -2;
 147       HANDLE_CONSTANTVALUE(constantvalue_index);
 148     }
 149   else
 150 #endif
 151 #ifdef HANDLE_CODE_ATTRIBUTE
 152   if (MATCH_ATTRIBUTE ("Code"))
 153     {
 154       uint16 j;
 155       uint16 max_stack ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 156       uint16 max_locals ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 157       uint32 code_length = JCF_readu4 (jcf);
 158       uint16 exception_table_length, attributes_count;
 159       if (code_length + 12 > attribute_length)
 160         return -1;
 161       HANDLE_CODE_ATTRIBUTE(max_stack, max_locals, code_length);
 162       JCF_SKIP (jcf, code_length);
 163       exception_table_length = JCF_readu2 (jcf);
 164       if (code_length + 8 * exception_table_length + 12 > attribute_length)
 165         return -1;
 166 #ifdef HANDLE_EXCEPTION_TABLE
 167       HANDLE_EXCEPTION_TABLE (jcf->read_ptr, exception_table_length);
 168 #endif
 169       JCF_SKIP (jcf, 2 * 4 * exception_table_length);
 170       attributes_count = JCF_readu2 (jcf);
 171       for (j = 0; j < attributes_count; j++)
 172         {
 173           int code = get_attribute (jcf);
 174           if (code != 0)
 175             return code;
 176         }
 177     }
 178   else
 179 #endif /* HANDLE_CODE_ATTRIBUTE */
 180 #ifdef HANDLE_EXCEPTIONS_ATTRIBUTE
 181   if (MATCH_ATTRIBUTE ("Exceptions"))
 182     {
 183       uint16 count = JCF_readu2 (jcf);
 184       HANDLE_EXCEPTIONS_ATTRIBUTE (count);
 185     }
 186   else
 187 #endif
 188 #ifdef HANDLE_LINENUMBERTABLE_ATTRIBUTE
 189   if (MATCH_ATTRIBUTE ("LineNumberTable"))
 190     {
 191       uint16 count = JCF_readu2 (jcf);
 192       HANDLE_LINENUMBERTABLE_ATTRIBUTE (count);
 193     }
 194   else
 195 #endif
 196 #ifdef HANDLE_LOCALVARIABLETABLE_ATTRIBUTE
 197   if (MATCH_ATTRIBUTE ("LocalVariableTable"))
 198     {
 199       uint16 count = JCF_readu2 (jcf);
 200       HANDLE_LOCALVARIABLETABLE_ATTRIBUTE (count);
 201     }
 202   else
 203 #endif
 204 #ifdef HANDLE_INNERCLASSES_ATTRIBUTE
 205   if (MATCH_ATTRIBUTE ("InnerClasses"))
 206     {
 207       uint16 count = JCF_readu2 (jcf);
 208       HANDLE_INNERCLASSES_ATTRIBUTE (count);
 209     }
 210   else
 211 #endif
 212 #ifdef HANDLE_SYNTHETIC_ATTRIBUTE
 213   if (MATCH_ATTRIBUTE ("Synthetic"))
 214     {
 215       HANDLE_SYNTHETIC_ATTRIBUTE ();
 216     }
 217   else
 218 #endif
 219 #ifdef HANDLE_GCJCOMPILED_ATTRIBUTE
 220   if (MATCH_ATTRIBUTE ("gnu.gcj.gcj-compiled"))
 221     {
 222       HANDLE_GCJCOMPILED_ATTRIBUTE ();
 223     }
 224   else
 225 #endif
 226     {
 227 #ifdef PROCESS_OTHER_ATTRIBUTE
 228       PROCESS_OTHER_ATTRIBUTE(jcf, attribute_name, attribute_length);
 229 #else
 230       JCF_SKIP (jcf, attribute_length);
 231 #endif
 232     }
 233   if ((long) (start_pos + attribute_length) != JCF_TELL(jcf))
 234     return -1;
 235   return 0;
 236 }
 237
 238 /* Read and handle the pre-amble. */
 239 static int
 240 DEFUN(jcf_parse_preamble, (jcf),
 241       JCF* jcf)
 242 {
 243   uint32 magic = (JCF_FILL (jcf, 8), JCF_readu4 (jcf));
 244   uint16 minor_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 245   uint16 major_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 246 #ifdef HANDLE_MAGIC
 247   HANDLE_MAGIC (magic, minor_version, major_version);
 248 #endif
 249   if (magic != 0xcafebabe)
 250     return -1;
 251   else
 252     return 0;
 253 }
 254
 255 /* Read and handle the constant pool.
 256
 257    Return 0 if OK.
 258    Return -2 if a bad cross-reference (index of other constant) was seen.
 259 */
 260 static int
 261 DEFUN(jcf_parse_constant_pool, (jcf),
 262       JCF* jcf)
 263 {
 264   int i, n;
 265   JPOOL_SIZE (jcf) = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
 266   jcf->cpool.tags = ALLOC (JPOOL_SIZE (jcf));
 267   jcf->cpool.data = ALLOC (sizeof (jword) * JPOOL_SIZE (jcf));
 268   jcf->cpool.tags[0] = 0;
 269 #ifdef HANDLE_START_CONSTANT_POOL
 270   HANDLE_START_CONSTANT_POOL (JPOOL_SIZE (jcf));
 271 #endif
 272   for (i = 1; i < (int) JPOOL_SIZE (jcf); i++)
 273     {
 274       int constant_kind;
 275
 276       /* Make sure at least 9 bytes are available.  This is enough
 277          for all fixed-sized constant pool entries (so we don't need many
 278          more JCF_FILL calls below), but is is small enough that
 279          we are guaranteed to not hit EOF (in a valid .class file). */
 280       JCF_FILL (jcf, 9);
 281       constant_kind = JCF_readu (jcf);
 282       jcf->cpool.tags[i] = constant_kind;
 283       switch (constant_kind)
 284         {
 285         case CONSTANT_String:
 286         case CONSTANT_Class:
 287           jcf->cpool.data[i] = JCF_readu2 (jcf);
 288           break;
 289         case CONSTANT_Fieldref:
 290         case CONSTANT_Methodref:
 291         case CONSTANT_InterfaceMethodref:
 292         case CONSTANT_NameAndType:
 293           jcf->cpool.data[i] = JCF_readu2 (jcf);
 294           jcf->cpool.data[i] |= JCF_readu2 (jcf) << 16;
 295           break;
 296         case CONSTANT_Integer:
 297         case CONSTANT_Float:
 298           jcf->cpool.data[i] = JCF_readu4 (jcf);
 299           break;
 300         case CONSTANT_Long:
 301         case CONSTANT_Double:
 302           jcf->cpool.data[i] = JCF_readu4 (jcf);
 303           i++; /* These take up two spots in the constant pool */
 304           jcf->cpool.tags[i] = 0;
 305           jcf->cpool.data[i] = JCF_readu4 (jcf);
 306           break;
 307         case CONSTANT_Utf8:
 308           n = JCF_readu2 (jcf);
 309           JCF_FILL (jcf, n);
 310 #ifdef HANDLE_CONSTANT_Utf8
 311           HANDLE_CONSTANT_Utf8(jcf, i, n);
 312 #else
 313           jcf->cpool.data[i] = JCF_TELL(jcf) - 2;
 314           JCF_SKIP (jcf, n);
 315 #endif
 316           break;
 317         default:
 318           return i;
 319         }
 320     }
 321   return 0;
 322 }
 323
 324 /* Read various class flags and numbers. */
 325
 326 static void
 327 DEFUN(jcf_parse_class, (jcf),
 328       JCF* jcf)
 329 {
 330   int i;
 331   uint16 interfaces_count;
 332   JCF_FILL (jcf, 8);
 333   jcf->access_flags = JCF_readu2 (jcf);
 334   jcf->this_class = JCF_readu2 (jcf);
 335   jcf->super_class = JCF_readu2 (jcf);
 336   interfaces_count = JCF_readu2 (jcf);
 337
 338 #ifdef HANDLE_CLASS_INFO
 339   HANDLE_CLASS_INFO(jcf->access_flags, jcf->this_class, jcf->super_class, interfaces_count);
 340 #endif
 341
 342   JCF_FILL (jcf, 2 * interfaces_count);
 343
 344   /* Read interfaces. */
 345   for (i = 0; i < interfaces_count; i++)
 346     {
 347       uint16 index ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 348 #ifdef HANDLE_CLASS_INTERFACE
 349       HANDLE_CLASS_INTERFACE (index);
 350 #endif
 351     }
 352 }
 353
 354 /* Read fields. */
 355 static int
 356 DEFUN(jcf_parse_fields, (jcf),
 357       JCF* jcf)
 358 {
 359   int i, j;
 360   uint16 fields_count;
 361   JCF_FILL (jcf, 2);
 362   fields_count = JCF_readu2 (jcf);
 363
 364 #ifdef HANDLE_START_FIELDS
 365   HANDLE_START_FIELDS (fields_count);
 366 #endif
 367   for (i = 0; i < fields_count; i++)
 368     {
 369       uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
 370       uint16 name_index = JCF_readu2 (jcf);
 371       uint16 signature_index = JCF_readu2 (jcf);
 372       uint16 attribute_count = JCF_readu2 (jcf);
 373 #ifdef HANDLE_START_FIELD
 374       HANDLE_START_FIELD (access_flags, name_index, signature_index,
 375                           attribute_count);
 376 #endif
 377       for (j = 0; j < attribute_count; j++)
 378         {
 379           int code = get_attribute (jcf);
 380           if (code != 0)
 381             return code;
 382         }
 383 #ifdef HANDLE_END_FIELD
 384       HANDLE_END_FIELD ();
 385 #endif
 386     }
 387 #ifdef HANDLE_END_FIELDS
 388   HANDLE_END_FIELDS ();
 389 #endif
 390   return 0;
 391 }
 392
 393 /* Read methods. */
 394
 395 static int
 396 DEFUN(jcf_parse_one_method, (jcf),
 397       JCF* jcf)
 398 {
 399   int i;
 400   uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
 401   uint16 name_index = JCF_readu2 (jcf);
 402   uint16 signature_index = JCF_readu2 (jcf);
 403   uint16 attribute_count = JCF_readu2 (jcf);
 404 #ifdef HANDLE_METHOD
 405   HANDLE_METHOD(access_flags, name_index, signature_index, attribute_count);
 406 #endif
 407   for (i = 0; i < attribute_count; i++)
 408     {
 409       int code = get_attribute (jcf);
 410       if (code != 0)
 411         return code;
 412     }
 413 #ifdef HANDLE_END_METHOD
 414   HANDLE_END_METHOD ();
 415 #endif
 416   return 0;
 417 }
 418
 419 static int
 420 DEFUN(jcf_parse_methods, (jcf),
 421       JCF* jcf)
 422 {
 423   int i;
 424   uint16 methods_count;
 425   JCF_FILL (jcf, 2);
 426   methods_count = JCF_readu2 (jcf);
 427 #ifdef HANDLE_START_METHODS
 428   HANDLE_START_METHODS (methods_count);
 429 #endif
 430   for (i = 0; i < methods_count; i++)
 431     {
 432       int code = jcf_parse_one_method (jcf);
 433       if (code != 0)
 434         return code;
 435     }
 436 #ifdef HANDLE_END_METHODS
 437   HANDLE_END_METHODS ();
 438 #endif
 439   return 0;
 440 }
 441
 442 /* Read attributes. */
 443 static int
 444 DEFUN(jcf_parse_final_attributes, (jcf),
 445       JCF *jcf)
 446 {
 447   int i;
 448   uint16 attributes_count = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
 449 #ifdef START_FINAL_ATTRIBUTES
 450   START_FINAL_ATTRIBUTES (attributes_count)
 451 #endif
 452   for (i = 0; i < attributes_count; i++)
 453     {
 454       int code = get_attribute (jcf);
 455       if (code != 0)
 456         return code;
 457     }
 458   return 0;
 459 }
 460