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  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 PROTO((JCF *));
  30 static int jcf_parse_preamble PROTO((JCF *));
  31 static int jcf_parse_constant_pool PROTO((JCF *));
  32 static void jcf_parse_class PROTO((JCF *));
  33 static int jcf_parse_fields PROTO((JCF *));
  34 static int jcf_parse_one_method PROTO((JCF *));
  35 static int jcf_parse_methods PROTO((JCF *));
  36 static int jcf_parse_final_attributes PROTO((JCF *));
  37
  38 static int
  39 DEFUN(get_attribute, (jcf),
  40       JCF *jcf)
  41 {
  42   uint16 attribute_name = (JCF_FILL (jcf, 6), JCF_readu2 (jcf));
  43   uint32 attribute_length = JCF_readu4 (jcf);
  44   uint32 start_pos = JCF_TELL(jcf);
  45   int name_length;
  46   const unsigned char *name_data;
  47   JCF_FILL (jcf, (long) attribute_length);
  48   if (attribute_name <= 0 || attribute_name >= JPOOL_SIZE(jcf))
  49     return -2;
  50   if (JPOOL_TAG (jcf, attribute_name) != CONSTANT_Utf8)
  51     return -2;
  52   name_length = JPOOL_UTF_LENGTH (jcf, attribute_name);
  53   name_data = JPOOL_UTF_DATA (jcf, attribute_name);
  54
  55 #ifdef IGNORE_ATTRIBUTE
  56    if (IGNORE_ATTRIBUTE (jcf, attribute_name, attribute_length))
  57      {
  58        JCF_SKIP (jcf, attribute_length);
  59      }
  60    else
  61 #endif
  62 #ifdef HANDLE_SOURCEFILE
  63   if (name_length == 10 && memcmp (name_data, "SourceFile", 10) == 0)
  64     {
  65       uint16 sourcefile_index = JCF_readu2 (jcf);
  66       HANDLE_SOURCEFILE(sourcefile_index);
  67     }
  68   else
  69 #endif
  70 #ifdef HANDLE_CONSTANTVALUE
  71   if (name_length == 13 && memcmp (name_data, "ConstantValue", 13) == 0)
  72     {
  73       uint16 constantvalue_index = JCF_readu2 (jcf);
  74       if (constantvalue_index <= 0 || constantvalue_index >= JPOOL_SIZE(jcf))
  75         return -2;
  76       HANDLE_CONSTANTVALUE(constantvalue_index);
  77     }
  78   else
  79 #endif
  80 #ifdef HANDLE_CODE_ATTRIBUTE
  81   if (name_length == 4 && memcmp (name_data, "Code", 4) == 0)
  82     {
  83       uint16 j;
  84       uint16 max_stack ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
  85       uint16 max_locals ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
  86       uint32 code_length = JCF_readu4 (jcf);
  87       uint16 exception_table_length, attributes_count;
  88       if (code_length + 12 > attribute_length)
  89         return -1;
  90       HANDLE_CODE_ATTRIBUTE(max_stack, max_locals, code_length);
  91       JCF_SKIP (jcf, code_length);
  92       exception_table_length = JCF_readu2 (jcf);
  93       if (code_length + 8 * exception_table_length + 12 > attribute_length)
  94         return -1;
  95 #ifdef HANDLE_EXCEPTION_TABLE
  96       HANDLE_EXCEPTION_TABLE (jcf->read_ptr, exception_table_length);
  97 #endif
  98       JCF_SKIP (jcf, 2 * 4 * exception_table_length);
  99       attributes_count = JCF_readu2 (jcf);
 100       for (j = 0; j < attributes_count; j++)
 101         {
 102           int code = get_attribute (jcf);
 103           if (code != 0)
 104             return code;
 105         }
 106     }
 107   else
 108 #endif /* HANDLE_CODE_ATTRIBUTE */
 109 #ifdef HANDLE_EXCEPTIONS_ATTRIBUTE
 110   if (name_length == 10 && memcmp (name_data, "Exceptions", 10) == 0)
 111     {
 112       uint16 count = JCF_readu2 (jcf);
 113       HANDLE_EXCEPTIONS_ATTRIBUTE (count);
 114     }
 115   else
 116 #endif
 117 #ifdef HANDLE_LINENUMBERTABLE_ATTRIBUTE
 118   if (name_length == 15 && memcmp (name_data, "LineNumberTable", 15) == 0)
 119     {
 120       uint16 count = JCF_readu2 (jcf);
 121       HANDLE_LINENUMBERTABLE_ATTRIBUTE (count);
 122     }
 123   else
 124 #endif
 125 #ifdef HANDLE_LOCALVARIABLETABLE_ATTRIBUTE
 126   if (name_length == 18 && memcmp (name_data, "LocalVariableTable", 18) == 0)
 127     {
 128       uint16 count = JCF_readu2 (jcf);
 129       HANDLE_LOCALVARIABLETABLE_ATTRIBUTE (count);
 130     }
 131   else
 132 #endif
 133     {
 134 #ifdef PROCESS_OTHER_ATTRIBUTE
 135       PROCESS_OTHER_ATTRIBUTE(jcf, attribute_name, attribute_length);
 136 #else
 137       JCF_SKIP (jcf, attribute_length);
 138 #endif
 139     }
 140   if ((long) (start_pos + attribute_length) != JCF_TELL(jcf))
 141     return -1;
 142   return 0;
 143 }
 144
 145 /* Read and handle the pre-amble. */
 146 static int
 147 DEFUN(jcf_parse_preamble, (jcf),
 148       JCF* jcf)
 149 {
 150   uint32 magic = (JCF_FILL (jcf, 8), JCF_readu4 (jcf));
 151   uint16 minor_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 152   uint16 major_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 153 #ifdef HANDLE_MAGIC
 154   HANDLE_MAGIC (magic, minor_version, major_version);
 155 #endif
 156   if (magic != 0xcafebabe)
 157     return -1;
 158   else
 159     return 0;
 160 }
 161
 162 /* Read and handle the constant pool.
 163
 164    Return 0 if OK.
 165    Return -2 if a bad cross-reference (index of other constant) was seen.
 166 */
 167 static int
 168 DEFUN(jcf_parse_constant_pool, (jcf),
 169       JCF* jcf)
 170 {
 171   int i, n;
 172   JPOOL_SIZE (jcf) = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
 173   jcf->cpool.tags = ALLOC (JPOOL_SIZE (jcf));
 174   jcf->cpool.data = ALLOC (sizeof (jword) * JPOOL_SIZE (jcf));
 175   jcf->cpool.tags[0] = 0;
 176 #ifdef HANDLE_START_CONSTANT_POOL
 177   HANDLE_START_CONSTANT_POOL (JPOOL_SIZE (jcf));
 178 #endif
 179   for (i = 1; i < (int) JPOOL_SIZE (jcf); i++)
 180     {
 181       int constant_kind;
 182
 183       /* Make sure at least 9 bytes are available.  This is enough
 184          for all fixed-sized constant pool entries (so we don't need many
 185          more JCF_FILL calls below), but is is small enough that
 186          we are guaranteed to not hit EOF (in a valid .class file). */
 187       JCF_FILL (jcf, 9);
 188       constant_kind = JCF_readu (jcf);
 189       jcf->cpool.tags[i] = constant_kind;
 190       switch (constant_kind)
 191         {
 192         case CONSTANT_String:
 193         case CONSTANT_Class:
 194           jcf->cpool.data[i] = JCF_readu2 (jcf);
 195           break;
 196         case CONSTANT_Fieldref:
 197         case CONSTANT_Methodref:
 198         case CONSTANT_InterfaceMethodref:
 199         case CONSTANT_NameAndType:
 200           jcf->cpool.data[i] = JCF_readu2 (jcf);
 201           jcf->cpool.data[i] |= JCF_readu2 (jcf) << 16;
 202           break;
 203         case CONSTANT_Integer:
 204         case CONSTANT_Float:
 205           jcf->cpool.data[i] = JCF_readu4 (jcf);
 206           break;
 207         case CONSTANT_Long:
 208         case CONSTANT_Double:
 209           jcf->cpool.data[i] = JCF_readu4 (jcf);
 210           i++; /* These take up two spots in the constant pool */
 211           jcf->cpool.tags[i] = 0;
 212           jcf->cpool.data[i] = JCF_readu4 (jcf);
 213           break;
 214         case CONSTANT_Utf8:
 215           n = JCF_readu2 (jcf);
 216           JCF_FILL (jcf, n);
 217 #ifdef HANDLE_CONSTANT_Utf8
 218           HANDLE_CONSTANT_Utf8(jcf, i, n);
 219 #else
 220           jcf->cpool.data[i] = JCF_TELL(jcf) - 2;
 221           JCF_SKIP (jcf, n);
 222 #endif
 223           break;
 224         default:
 225           return i;
 226         }
 227     }
 228   return 0;
 229 }
 230
 231 /* Read various class flags and numbers. */
 232
 233 static void
 234 DEFUN(jcf_parse_class, (jcf),
 235       JCF* jcf)
 236 {
 237   int i;
 238   uint16 interfaces_count;
 239   JCF_FILL (jcf, 8);
 240   jcf->access_flags = JCF_readu2 (jcf);
 241   jcf->this_class = JCF_readu2 (jcf);
 242   jcf->super_class = JCF_readu2 (jcf);
 243   interfaces_count = JCF_readu2 (jcf);
 244
 245 #ifdef HANDLE_CLASS_INFO
 246   HANDLE_CLASS_INFO(jcf->access_flags, jcf->this_class, jcf->super_class, interfaces_count);
 247 #endif
 248
 249   JCF_FILL (jcf, 2 * interfaces_count);
 250
 251   /* Read interfaces. */
 252   for (i = 0; i < interfaces_count; i++)
 253     {
 254       uint16 index ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
 255 #ifdef HANDLE_CLASS_INTERFACE
 256       HANDLE_CLASS_INTERFACE (index);
 257 #endif
 258     }
 259 }
 260
 261 /* Read fields. */
 262 static int
 263 DEFUN(jcf_parse_fields, (jcf),
 264       JCF* jcf)
 265 {
 266   int i, j;
 267   uint16 fields_count;
 268   JCF_FILL (jcf, 2);
 269   fields_count = JCF_readu2 (jcf);
 270
 271 #ifdef HANDLE_START_FIELDS
 272   HANDLE_START_FIELDS (fields_count);
 273 #endif
 274   for (i = 0; i < fields_count; i++)
 275     {
 276       uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
 277       uint16 name_index = JCF_readu2 (jcf);
 278       uint16 signature_index = JCF_readu2 (jcf);
 279       uint16 attribute_count = JCF_readu2 (jcf);
 280 #ifdef HANDLE_START_FIELD
 281       HANDLE_START_FIELD (access_flags, name_index, signature_index,
 282                     attribute_count);
 283 #endif
 284       for (j = 0; j < attribute_count; j++)
 285         {
 286           int code = get_attribute (jcf);
 287           if (code != 0)
 288             return code;
 289         }
 290 #ifdef HANDLE_END_FIELD
 291       HANDLE_END_FIELD ();
 292 #endif
 293     }
 294 #ifdef HANDLE_END_FIELDS
 295   HANDLE_END_FIELDS ();
 296 #endif
 297   return 0;
 298 }
 299
 300 /* Read methods. */
 301
 302 static int
 303 DEFUN(jcf_parse_one_method, (jcf),
 304       JCF* jcf)
 305 {
 306   int i;
 307   uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
 308   uint16 name_index = JCF_readu2 (jcf);
 309   uint16 signature_index = JCF_readu2 (jcf);
 310   uint16 attribute_count = JCF_readu2 (jcf);
 311 #ifdef HANDLE_METHOD
 312   HANDLE_METHOD(access_flags, name_index, signature_index, attribute_count);
 313 #endif
 314   for (i = 0; i < attribute_count; i++)
 315     {
 316       int code = get_attribute (jcf);
 317       if (code != 0)
 318         return code;
 319     }
 320 #ifdef HANDLE_END_METHOD
 321   HANDLE_END_METHOD ();
 322 #endif
 323   return 0;
 324 }
 325
 326 static int
 327 DEFUN(jcf_parse_methods, (jcf),
 328       JCF* jcf)
 329 {
 330   int i;
 331   uint16 methods_count;
 332   JCF_FILL (jcf, 2);
 333   methods_count = JCF_readu2 (jcf);
 334 #ifdef HANDLE_START_METHODS
 335   HANDLE_START_METHODS (methods_count);
 336 #endif
 337   for (i = 0; i < methods_count; i++)
 338     {
 339       int code = jcf_parse_one_method (jcf);
 340       if (code != 0)
 341         return code;
 342     }
 343 #ifdef HANDLE_END_METHODS
 344   HANDLE_END_METHODS ();
 345 #endif
 346   return 0;
 347 }
 348
 349 /* Read attributes. */
 350 static int
 351 DEFUN(jcf_parse_final_attributes, (jcf),
 352       JCF *jcf)
 353 {
 354   int i;
 355   uint16 attributes_count = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
 356 #ifdef START_FINAL_ATTRIBUTES
 357   START_FINAL_ATTRIBUTES (attributes_count)
 358 #endif
 359   for (i = 0; i < attributes_count; i++)
 360     {
 361       int code = get_attribute (jcf);
 362       if (code != 0)
 363         return code;
 364     }
 365   return 0;
 366 }
 367