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