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.
5 Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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)
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.
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.
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. */
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 *));
39 DEFUN(get_attribute, (jcf),
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);
46 const unsigned char *name_data;
47 JCF_FILL (jcf, (long) attribute_length);
48 if (attribute_name <= 0 || attribute_name >= JPOOL_SIZE(jcf))
50 if (JPOOL_TAG (jcf, attribute_name) != CONSTANT_Utf8)
52 name_length = JPOOL_UTF_LENGTH (jcf, attribute_name);
53 name_data = JPOOL_UTF_DATA (jcf, attribute_name);
55 #ifdef IGNORE_ATTRIBUTE
56 if (IGNORE_ATTRIBUTE (jcf, attribute_name, attribute_length))
58 JCF_SKIP (jcf, attribute_length);
62 #ifdef HANDLE_SOURCEFILE
63 if (name_length == 10 && memcmp (name_data, "SourceFile", 10) == 0)
65 uint16 sourcefile_index = JCF_readu2 (jcf);
66 HANDLE_SOURCEFILE(sourcefile_index);
70 #ifdef HANDLE_CONSTANTVALUE
71 if (name_length == 13 && memcmp (name_data, "ConstantValue", 13) == 0)
73 uint16 constantvalue_index = JCF_readu2 (jcf);
74 if (constantvalue_index <= 0 || constantvalue_index >= JPOOL_SIZE(jcf))
76 HANDLE_CONSTANTVALUE(constantvalue_index);
80 #ifdef HANDLE_CODE_ATTRIBUTE
81 if (name_length == 4 && memcmp (name_data, "Code", 4) == 0)
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)
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)
95 #ifdef HANDLE_EXCEPTION_TABLE
96 HANDLE_EXCEPTION_TABLE (jcf->read_ptr, exception_table_length);
98 JCF_SKIP (jcf, 2 * 4 * exception_table_length);
99 attributes_count = JCF_readu2 (jcf);
100 for (j = 0; j < attributes_count; j++)
102 int code = get_attribute (jcf);
108 #endif /* HANDLE_CODE_ATTRIBUTE */
109 #ifdef HANDLE_EXCEPTIONS_ATTRIBUTE
110 if (name_length == 10 && memcmp (name_data, "Exceptions", 10) == 0)
112 uint16 count = JCF_readu2 (jcf);
113 HANDLE_EXCEPTIONS_ATTRIBUTE (count);
117 #ifdef HANDLE_LINENUMBERTABLE_ATTRIBUTE
118 if (name_length == 15 && memcmp (name_data, "LineNumberTable", 15) == 0)
120 uint16 count = JCF_readu2 (jcf);
121 HANDLE_LINENUMBERTABLE_ATTRIBUTE (count);
125 #ifdef HANDLE_LOCALVARIABLETABLE_ATTRIBUTE
126 if (name_length == 18 && memcmp (name_data, "LocalVariableTable", 18) == 0)
128 uint16 count = JCF_readu2 (jcf);
129 HANDLE_LOCALVARIABLETABLE_ATTRIBUTE (count);
133 #ifdef HANDLE_INNERCLASSES_ATTRIBUTE
134 if (name_length == 12 && memcmp (name_data, "InnerClasses", 12) == 0)
136 uint16 count = JCF_readu2 (jcf);
137 HANDLE_INNERCLASSES_ATTRIBUTE (count);
142 #ifdef PROCESS_OTHER_ATTRIBUTE
143 PROCESS_OTHER_ATTRIBUTE(jcf, attribute_name, attribute_length);
145 JCF_SKIP (jcf, attribute_length);
148 if ((long) (start_pos + attribute_length) != JCF_TELL(jcf))
153 /* Read and handle the pre-amble. */
155 DEFUN(jcf_parse_preamble, (jcf),
158 uint32 magic = (JCF_FILL (jcf, 8), JCF_readu4 (jcf));
159 uint16 minor_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
160 uint16 major_version ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
162 HANDLE_MAGIC (magic, minor_version, major_version);
164 if (magic != 0xcafebabe)
170 /* Read and handle the constant pool.
173 Return -2 if a bad cross-reference (index of other constant) was seen.
176 DEFUN(jcf_parse_constant_pool, (jcf),
180 JPOOL_SIZE (jcf) = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
181 jcf->cpool.tags = ALLOC (JPOOL_SIZE (jcf));
182 jcf->cpool.data = ALLOC (sizeof (jword) * JPOOL_SIZE (jcf));
183 jcf->cpool.tags[0] = 0;
184 #ifdef HANDLE_START_CONSTANT_POOL
185 HANDLE_START_CONSTANT_POOL (JPOOL_SIZE (jcf));
187 for (i = 1; i < (int) JPOOL_SIZE (jcf); i++)
191 /* Make sure at least 9 bytes are available. This is enough
192 for all fixed-sized constant pool entries (so we don't need many
193 more JCF_FILL calls below), but is is small enough that
194 we are guaranteed to not hit EOF (in a valid .class file). */
196 constant_kind = JCF_readu (jcf);
197 jcf->cpool.tags[i] = constant_kind;
198 switch (constant_kind)
200 case CONSTANT_String:
202 jcf->cpool.data[i] = JCF_readu2 (jcf);
204 case CONSTANT_Fieldref:
205 case CONSTANT_Methodref:
206 case CONSTANT_InterfaceMethodref:
207 case CONSTANT_NameAndType:
208 jcf->cpool.data[i] = JCF_readu2 (jcf);
209 jcf->cpool.data[i] |= JCF_readu2 (jcf) << 16;
211 case CONSTANT_Integer:
213 jcf->cpool.data[i] = JCF_readu4 (jcf);
216 case CONSTANT_Double:
217 jcf->cpool.data[i] = JCF_readu4 (jcf);
218 i++; /* These take up two spots in the constant pool */
219 jcf->cpool.tags[i] = 0;
220 jcf->cpool.data[i] = JCF_readu4 (jcf);
223 n = JCF_readu2 (jcf);
225 #ifdef HANDLE_CONSTANT_Utf8
226 HANDLE_CONSTANT_Utf8(jcf, i, n);
228 jcf->cpool.data[i] = JCF_TELL(jcf) - 2;
239 /* Read various class flags and numbers. */
242 DEFUN(jcf_parse_class, (jcf),
246 uint16 interfaces_count;
248 jcf->access_flags = JCF_readu2 (jcf);
249 jcf->this_class = JCF_readu2 (jcf);
250 jcf->super_class = JCF_readu2 (jcf);
251 interfaces_count = JCF_readu2 (jcf);
253 #ifdef HANDLE_CLASS_INFO
254 HANDLE_CLASS_INFO(jcf->access_flags, jcf->this_class, jcf->super_class, interfaces_count);
257 JCF_FILL (jcf, 2 * interfaces_count);
259 /* Read interfaces. */
260 for (i = 0; i < interfaces_count; i++)
262 uint16 index ATTRIBUTE_UNUSED = JCF_readu2 (jcf);
263 #ifdef HANDLE_CLASS_INTERFACE
264 HANDLE_CLASS_INTERFACE (index);
271 DEFUN(jcf_parse_fields, (jcf),
277 fields_count = JCF_readu2 (jcf);
279 #ifdef HANDLE_START_FIELDS
280 HANDLE_START_FIELDS (fields_count);
282 for (i = 0; i < fields_count; i++)
284 uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
285 uint16 name_index = JCF_readu2 (jcf);
286 uint16 signature_index = JCF_readu2 (jcf);
287 uint16 attribute_count = JCF_readu2 (jcf);
288 #ifdef HANDLE_START_FIELD
289 HANDLE_START_FIELD (access_flags, name_index, signature_index,
292 for (j = 0; j < attribute_count; j++)
294 int code = get_attribute (jcf);
298 #ifdef HANDLE_END_FIELD
302 #ifdef HANDLE_END_FIELDS
303 HANDLE_END_FIELDS ();
311 DEFUN(jcf_parse_one_method, (jcf),
315 uint16 access_flags = (JCF_FILL (jcf, 8), JCF_readu2 (jcf));
316 uint16 name_index = JCF_readu2 (jcf);
317 uint16 signature_index = JCF_readu2 (jcf);
318 uint16 attribute_count = JCF_readu2 (jcf);
320 HANDLE_METHOD(access_flags, name_index, signature_index, attribute_count);
322 for (i = 0; i < attribute_count; i++)
324 int code = get_attribute (jcf);
328 #ifdef HANDLE_END_METHOD
329 HANDLE_END_METHOD ();
335 DEFUN(jcf_parse_methods, (jcf),
339 uint16 methods_count;
341 methods_count = JCF_readu2 (jcf);
342 #ifdef HANDLE_START_METHODS
343 HANDLE_START_METHODS (methods_count);
345 for (i = 0; i < methods_count; i++)
347 int code = jcf_parse_one_method (jcf);
351 #ifdef HANDLE_END_METHODS
352 HANDLE_END_METHODS ();
357 /* Read attributes. */
359 DEFUN(jcf_parse_final_attributes, (jcf),
363 uint16 attributes_count = (JCF_FILL (jcf, 2), JCF_readu2 (jcf));
364 #ifdef START_FINAL_ATTRIBUTES
365 START_FINAL_ATTRIBUTES (attributes_count)
367 for (i = 0; i < attributes_count; i++)
369 int code = get_attribute (jcf);