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