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    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006,
   5    2007, 2008 Free Software Foundation, Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.
  22
  23 Java and all Java-based marks are trademarks or registered trademarks
  24 of Sun Microsystems, Inc. in the United States and other countries.
  25 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  26
  27 #include "ggc.h"
  28 #include "jcf.h"
  29 #include "zipfile.h"
  30
  31 static int get_attribute (JCF *, int, jv_attr_type);
  32 static int jcf_parse_preamble (JCF *);
  33 static int jcf_parse_constant_pool (JCF *);
  34 static void jcf_parse_class (JCF *);
  35 static int jcf_parse_fields (JCF *);
  36 static int jcf_parse_one_method (JCF *, int);
  37 static int jcf_parse_methods (JCF *);
  38 static int jcf_parse_final_attributes (JCF *);
  39 #ifdef NEED_PEEK_ATTRIBUTE
  40 static int peek_attribute (JCF *, int, const char *, int);
  41 #endif
  42 #ifdef NEED_SKIP_ATTRIBUTE
  43 static void skip_attribute (JCF *, int);
  44 #endif
  45
  46 /* Go through all available attribute (ATTRIBUTE_NUMER) and try to
  47    identify PEEKED_NAME.  Return 1 if PEEKED_NAME was found, 0
  48    otherwise. JCF is restored to its initial position before
  49    returning.  */
  50
  51 #ifdef NEED_PEEK_ATTRIBUTE      /* Not everyone uses this function */
  52 static int
  53 peek_attribute (JCF *jcf, int attribute_number, const char *peeked_name,
  54                 int peeked_name_length)
  55 {
  56   int to_return = 0;
  57   long absolute_offset = (long)JCF_TELL (jcf);
  58   int i;
  59
  60   for (i = 0; !to_return && i < attribute_number; i++)
  61     {
  62       uint16 attribute_name = (JCF_FILL (jcf, 6), JCF_readu2 (jcf));
  63       uint32 attribute_length = JCF_readu4 (jcf);
  64       int name_length;
  65       const unsigned char *name_data;
  66
  67       JCF_FILL (jcf, (long) attribute_length);
  68       if (attribute_name <= 0 || attribute_name >= JPOOL_SIZE(jcf)
  69           || JPOOL_TAG (jcf, attribute_name) != CONSTANT_Utf8)
  70         continue;
  71
  72       name_length = JPOOL_UTF_LENGTH (jcf, attribute_name);
  73       name_data = JPOOL_UTF_DATA (jcf, attribute_name);
  74
  75       if (name_length == peeked_name_length
  76           && ! memcmp (name_data, peeked_name, peeked_name_length))
  77         {
  78           to_return = 1;
  79           break;
  80         }
  81
  82       JCF_SKIP (jcf, attribute_length);
  83     }
  84
  85   JCF_SEEK (jcf, absolute_offset);
  86   return to_return;
  87 }
  88 #endif
  89
  90 #ifdef NEED_SKIP_ATTRIBUTE      /* Not everyone uses this function */
  91 static void
  92 skip_attribute (JCF *jcf, int number_of_attribute)
  93 {
  94   while (number_of_attribute--)
  95     {
  96       JCF_u4 N;
  97       JCF_FILL (jcf, 6);
  98       (void) JCF_readu2 (jcf);
  99       N = JCF_readu4 (jcf);
 100       JCF_SKIP (jcf, N);
 101     }
 102 }
 103 #endif
 104
 105 static int
 106 get_attribute (JCF *jcf, int index,
 107                jv_attr_type attr_type ATTRIBUTE_UNUSED)
 108 {
 109   uint16 attribute_name = (JCF_FILL (jcf, 6), JCF_readu2 (jcf));
 110   uint32 attribute_length = JCF_readu4 (jcf);
 111   uint32 start_pos = JCF_TELL(jcf);
 112   int name_length;
 113   const unsigned char *name_data;
 114   JCF_FILL (jcf, (long) attribute_length);
 115   if (attribute_name <= 0 || attribute_name >= JPOOL_SIZE(jcf))
 116     return -2;
 117   if (JPOOL_TAG (jcf, attribute_name) != CONSTANT_Utf8)
 118     return -2;
 119   name_length = JPOOL_UTF_LENGTH (jcf, attribute_name);
 120   name_data = JPOOL_UTF_DATA (jcf, attribute_name);
 121
 122 #define MATCH_ATTRIBUTE(S) \
 123   (name_length == sizeof (S)-1 && memcmp (name_data, S, sizeof (S)-1) == 0)
 124
 125 #ifdef IGNORE_ATTRIBUTE
 126    if (IGNORE_ATTRIBUTE (jcf, attribute_name, attribute_length))
 127      {
 128        JCF_SKIP (jcf, attribute_length);
 129      }
 130    else
 131 #endif
 132 #ifdef HANDLE_SOURCEFILE
 133   if (MATCH_ATTRIBUTE ("SourceFile"))
 134     {
 135       uint16 sourcefile_index = JCF_readu2 (jcf);
 136       HANDLE_SOURCEFILE(sourcefile_index);
 137     }
 138   else
 139 #endif
 140 #ifdef HANDLE_CONSTANTVALUE
 141   if (MATCH_ATTRIBUTE ("ConstantValue"))
 142     {
 143       uint16 constantvalue_index = JCF_readu2 (jcf);
 144       if (constantvalue_index <= 0 || constantvalue_index >= JPOOL_SIZE(jcf))
 145         return -2;
 146       HANDLE_CONSTANTVALUE(constantvalue_index);
 147     }
 148   else
 149 #endif
 150 #ifdef HANDLE_CODE_ATTRIBUTE
 151   if (MATCH_ATTRIBUTE ("Code"))
 152     {
 153       uint16 j;
 154       uint16 max_stack ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 155       uint16 max_locals ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 156       uint32 code_length = JCF_readu4 (jcf);
 157       uint16 exception_table_length, attributes_count;
 158       if (code_length + 12 > attribute_length)
 159         return -1;
 160       HANDLE_CODE_ATTRIBUTE(max_stack, max_locals, code_length);
 161       JCF_SKIP (jcf, code_length);
 162       exception_table_length = JCF_readu2 (jcf);
 163       if (code_length + 8 * exception_table_length + 12 > attribute_length)
 164         return -1;
 165 #ifdef HANDLE_EXCEPTION_TABLE
 166       HANDLE_EXCEPTION_TABLE (jcf->read_ptr, exception_table_length);
 167 #endif
 168       JCF_SKIP (jcf, 2 * 4 * exception_table_length);
 169       attributes_count = JCF_readu2 (jcf);
 170       for (j = 0; j < attributes_count; j++)
 171         {
 172           int code = get_attribute (jcf, index, JV_METHOD_ATTR);
 173           if (code != 0)
 174             return code;
 175         }
 176     }
 177   else
 178 #endif /* HANDLE_CODE_ATTRIBUTE */
 179 #ifdef HANDLE_EXCEPTIONS_ATTRIBUTE
 180   if (MATCH_ATTRIBUTE ("Exceptions"))
 181     {
 182       uint16 count = JCF_readu2 (jcf);
 183       HANDLE_EXCEPTIONS_ATTRIBUTE (count);
 184     }
 185   else
 186 #endif
 187 #ifdef HANDLE_LINENUMBERTABLE_ATTRIBUTE
 188   if (MATCH_ATTRIBUTE ("LineNumberTable"))
 189     {
 190       uint16 count = JCF_readu2 (jcf);
 191       HANDLE_LINENUMBERTABLE_ATTRIBUTE (count);
 192     }
 193   else
 194 #endif
 195 #ifdef HANDLE_LOCALVARIABLETABLE_ATTRIBUTE
 196   if (MATCH_ATTRIBUTE ("LocalVariableTable"))
 197     {
 198       uint16 count = JCF_readu2 (jcf);
 199       HANDLE_LOCALVARIABLETABLE_ATTRIBUTE (count);
 200     }
 201   else
 202 #endif
 203 #ifdef HANDLE_LOCALVARIABLETYPETABLE_ATTRIBUTE
 204   if (MATCH_ATTRIBUTE ("LocalVariableTypeTable"))
 205     {
 206       uint16 count = JCF_readu2 (jcf);
 207       HANDLE_LOCALVARIABLETYPETABLE_ATTRIBUTE (count);
 208     }
 209   else
 210 #endif
 211 #ifdef HANDLE_INNERCLASSES_ATTRIBUTE
 212   if (MATCH_ATTRIBUTE ("InnerClasses"))
 213     {
 214       uint16 count = JCF_readu2 (jcf);
 215       HANDLE_INNERCLASSES_ATTRIBUTE (count);
 216     }
 217   else
 218 #endif
 219 #ifdef HANDLE_SYNTHETIC_ATTRIBUTE
 220   if (MATCH_ATTRIBUTE ("Synthetic"))
 221     {
 222       HANDLE_SYNTHETIC_ATTRIBUTE ();
 223     }
 224   else
 225 #endif
 226 #ifdef HANDLE_GCJCOMPILED_ATTRIBUTE
 227   if (MATCH_ATTRIBUTE ("gnu.gcj.gcj-compiled"))
 228     {
 229       HANDLE_GCJCOMPILED_ATTRIBUTE ();
 230     }
 231   else
 232 #endif
 233 #ifdef HANDLE_DEPRECATED_ATTRIBUTE
 234   if (MATCH_ATTRIBUTE ("Deprecated"))
 235     {
 236       HANDLE_DEPRECATED_ATTRIBUTE ();
 237     }
 238   else
 239 #endif
 240 #ifdef HANDLE_SOURCEDEBUGEXTENSION_ATTRIBUTE
 241   if (MATCH_ATTRIBUTE ("SourceDebugExtension")) /* JSR 45 */
 242     {
 243       HANDLE_SOURCEDEBUGEXTENSION_ATTRIBUTE (attribute_length);
 244     }
 245   else
 246 #endif
 247 #ifdef HANDLE_ENCLOSINGMETHOD_ATTRIBUTE
 248   if (MATCH_ATTRIBUTE ("EnclosingMethod"))
 249     {
 250       HANDLE_ENCLOSINGMETHOD_ATTRIBUTE ();
 251     }
 252   else
 253 #endif
 254 #ifdef HANDLE_SIGNATURE_ATTRIBUTE
 255   if (MATCH_ATTRIBUTE ("Signature"))
 256     {
 257       HANDLE_SIGNATURE_ATTRIBUTE ();
 258     }
 259   else
 260 #endif
 261 #ifdef HANDLE_RUNTIMEVISIBLEANNOTATIONS_ATTRIBUTE
 262   if (MATCH_ATTRIBUTE ("RuntimeVisibleAnnotations"))
 263     {
 264       HANDLE_RUNTIMEVISIBLEANNOTATIONS_ATTRIBUTE ();
 265     }
 266   else
 267 #endif
 268 #ifdef HANDLE_RUNTIMEINVISIBLEANNOTATIONS_ATTRIBUTE
 269   if (MATCH_ATTRIBUTE ("RuntimeInvisibleAnnotations"))
 270     {
 271       HANDLE_RUNTIMEINVISIBLEANNOTATIONS_ATTRIBUTE ();
 272     }
 273   else
 274 #endif
 275 #ifdef HANDLE_RUNTIMEVISIBLEPARAMETERANNOTATIONS_ATTRIBUTE
 276   if (MATCH_ATTRIBUTE ("RuntimeVisibleParameterAnnotations"))
 277     {
 278       HANDLE_RUNTIMEVISIBLEPARAMETERANNOTATIONS_ATTRIBUTE ();
 279     }
 280   else
 281 #endif
 282 #ifdef HANDLE_RUNTIMEINVISIBLEPARAMETERANNOTATIONS_ATTRIBUTE
 283   if (MATCH_ATTRIBUTE ("RuntimeInvisibleParameterAnnotations"))
 284     {
 285       HANDLE_RUNTIMEINVISIBLEPARAMETERANNOTATIONS_ATTRIBUTE ();
 286     }
 287   else
 288 #endif
 289 #ifdef HANDLE_ANNOTATIONDEFAULT_ATTRIBUTE
 290   if (MATCH_ATTRIBUTE ("AnnotationDefault"))
 291     {
 292       HANDLE_ANNOTATIONDEFAULT_ATTRIBUTE ();
 293     }
 294   else
 295 #endif
 296     {
 297 #ifdef PROCESS_OTHER_ATTRIBUTE
 298       PROCESS_OTHER_ATTRIBUTE(jcf, attribute_name, attribute_length);
 299 #else
 300       JCF_SKIP (jcf, attribute_length);
 301 #endif
 302     }
 303   if ((long) (start_pos + attribute_length) != JCF_TELL(jcf))
 304     return -1;
 305   return 0;
 306 }
 307
 308 /* Read and handle the pre-amble. */
 309 static int
 310 jcf_parse_preamble (JCF* jcf)
 311 {
 312   uint32 magic = (JCF_FILL (jcf, 8), JCF_readu4 (jcf));
 313   uint16 minor_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 314   uint16 major_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 315 #ifdef HANDLE_MAGIC
 316   HANDLE_MAGIC (magic, minor_version, major_version);
 317 #endif
 318   if (magic != 0xcafebabe)
 319     return -1;
 320   else
 321     return 0;
 322 }
 323
 324 /* Read and handle the constant pool.
 325
 326    Return 0 if OK.
 327    Return -2 if a bad cross-reference (index of other constant) was seen.
 328 */
 329 static int
 330 jcf_parse_constant_pool (JCF* jcf)
 331 {
 332   int i, n;
 333   JPOOL_SIZE (jcf) = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
 334   jcf->cpool.tags = (uint8 *) ggc_alloc_atomic (JPOOL_SIZE (jcf));
 335   jcf->cpool.data = ggc_alloc_cpool_entry (sizeof (jword) * JPOOL_SIZE (jcf));
 336   jcf->cpool.tags[0] = 0;
 337 #ifdef HANDLE_START_CONSTANT_POOL
 338   HANDLE_START_CONSTANT_POOL (JPOOL_SIZE (jcf));
 339 #endif
 340   for (i = 1; i < (int) JPOOL_SIZE (jcf); i++)
 341     {
 342       int constant_kind;
 343
 344       /* Make sure at least 9 bytes are available.  This is enough
 345          for all fixed-sized constant pool entries (so we don't need many
 346          more JCF_FILL calls below), but is is small enough that
 347          we are guaranteed to not hit EOF (in a valid .class file). */
 348       JCF_FILL (jcf, 9);
 349       constant_kind = JCF_readu (jcf);
 350       jcf->cpool.tags[i] = constant_kind;
 351       switch (constant_kind)
 352         {
 353         case CONSTANT_String:
 354         case CONSTANT_Class:
 355           jcf->cpool.data[i].w = JCF_readu2 (jcf);
 356           break;
 357         case CONSTANT_Fieldref:
 358         case CONSTANT_Methodref:
 359         case CONSTANT_InterfaceMethodref:
 360         case CONSTANT_NameAndType:
 361           jcf->cpool.data[i].w = JCF_readu2 (jcf);
 362           jcf->cpool.data[i].w |= JCF_readu2 (jcf) << 16;
 363           break;
 364         case CONSTANT_Integer:
 365         case CONSTANT_Float:
 366           jcf->cpool.data[i].w = JCF_readu4 (jcf);
 367           break;
 368         case CONSTANT_Long:
 369         case CONSTANT_Double:
 370           jcf->cpool.data[i].w = JCF_readu4 (jcf);
 371           i++; /* These take up two spots in the constant pool */
 372           jcf->cpool.tags[i] = 0;
 373           jcf->cpool.data[i].w = JCF_readu4 (jcf);
 374           break;
 375         case CONSTANT_Utf8:
 376           n = JCF_readu2 (jcf);
 377           JCF_FILL (jcf, n);
 378 #ifdef HANDLE_CONSTANT_Utf8
 379           HANDLE_CONSTANT_Utf8(jcf, i, n);
 380 #else
 381           jcf->cpool.data[i].w = JCF_TELL(jcf) - 2;
 382           JCF_SKIP (jcf, n);
 383 #endif
 384           break;
 385         default:
 386           return i;
 387         }
 388     }
 389   return 0;
 390 }
 391
 392 /* Read various class flags and numbers. */
 393
 394 static void
 395 jcf_parse_class (JCF* jcf)
 396 {
 397   int i;
 398   uint16 interfaces_count;
 399   JCF_FILL (jcf, 8);
 400   jcf->access_flags = JCF_readu2 (jcf);
 401   jcf->this_class = JCF_readu2 (jcf);
 402   jcf->super_class = JCF_readu2 (jcf);
 403   interfaces_count = JCF_readu2 (jcf);
 404
 405 #ifdef HANDLE_CLASS_INFO
 406   HANDLE_CLASS_INFO(jcf->access_flags, jcf->this_class, jcf->super_class, interfaces_count);
 407 #endif
 408
 409   JCF_FILL (jcf, 2 * interfaces_count);
 410
 411   /* Read interfaces. */
 412   for (i = 0; i < interfaces_count; i++)
 413     {
 414       uint16 index ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 415 #ifdef HANDLE_CLASS_INTERFACE
 416       HANDLE_CLASS_INTERFACE (index);
 417 #endif
 418     }
 419 }
 420
 421 /* Read fields. */
 422 static int
 423 jcf_parse_fields (JCF* jcf)
 424 {
 425   int i, j;
 426   uint16 fields_count;
 427   JCF_FILL (jcf, 2);
 428   fields_count = JCF_readu2 (jcf);
 429
 430 #ifdef HANDLE_START_FIELDS
 431   HANDLE_START_FIELDS (fields_count);
 432 #endif
 433   for (i = 0; i < fields_count; i++)
 434     {
 435       uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
 436       uint16 name_index = JCF_readu2 (jcf);
 437       uint16 signature_index = JCF_readu2 (jcf);
 438       uint16 attribute_count = JCF_readu2 (jcf);
 439 #ifdef HANDLE_START_FIELD
 440       HANDLE_START_FIELD (access_flags, name_index, signature_index,
 441                           attribute_count);
 442 #endif
 443       for (j = 0; j < attribute_count; j++)
 444         {
 445           int code = get_attribute (jcf, i, JV_FIELD_ATTR);
 446           if (code != 0)
 447             return code;
 448         }
 449 #ifdef HANDLE_END_FIELD
 450       HANDLE_END_FIELD ();
 451 #endif
 452     }
 453 #ifdef HANDLE_END_FIELDS
 454   HANDLE_END_FIELDS ();
 455 #endif
 456   return 0;
 457 }
 458
 459 /* Read methods. */
 460
 461 static int
 462 jcf_parse_one_method (JCF* jcf, int index)
 463 {
 464   int i;
 465   uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
 466   uint16 name_index = JCF_readu2 (jcf);
 467   uint16 signature_index = JCF_readu2 (jcf);
 468   uint16 attribute_count = JCF_readu2 (jcf);
 469 #ifdef HANDLE_METHOD
 470   HANDLE_METHOD(access_flags, name_index, signature_index, attribute_count);
 471 #endif
 472   for (i = 0; i < attribute_count; i++)
 473     {
 474       int code = get_attribute (jcf, index, JV_METHOD_ATTR);
 475       if (code != 0)
 476         return code;
 477     }
 478 #ifdef HANDLE_END_METHOD
 479   HANDLE_END_METHOD ();
 480 #endif
 481   return 0;
 482 }
 483
 484 static int
 485 jcf_parse_methods (JCF* jcf)
 486 {
 487   int i;
 488   uint16 methods_count;
 489   JCF_FILL (jcf, 2);
 490   methods_count = JCF_readu2 (jcf);
 491 #ifdef HANDLE_START_METHODS
 492   HANDLE_START_METHODS (methods_count);
 493 #endif
 494   for (i = 0; i < methods_count; i++)
 495     {
 496       int code = jcf_parse_one_method (jcf, i);
 497       if (code != 0)
 498         return code;
 499     }
 500 #ifdef HANDLE_END_METHODS
 501   HANDLE_END_METHODS ();
 502 #endif
 503   return 0;
 504 }
 505
 506 /* Read attributes. */
 507 static int
 508 jcf_parse_final_attributes (JCF *jcf)
 509 {
 510   int i;
 511   uint16 attributes_count = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
 512 #ifdef START_FINAL_ATTRIBUTES
 513   START_FINAL_ATTRIBUTES (attributes_count)
 514 #endif
 515   for (i = 0; i < attributes_count; i++)
 516     {
 517       int code = get_attribute (jcf, i, JV_CLASS_ATTR);
 518       if (code != 0)
 519         return code;
 520     }
 521   return 0;
 522 }
 523