1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CLASSFILE_CLASSFILEPARSER_HPP
26 #define SHARE_VM_CLASSFILE_CLASSFILEPARSER_HPP
27
28 #include "classfile/classFileStream.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "oops/typeArrayOop.hpp"
32 #include "runtime/handles.inline.hpp"
33 #include "utilities/accessFlags.hpp"
34
35 class TempNewSymbol;
36 class FieldAllocationCount;
37
38
39 // Parser for for .class files
40 //
41 // The bytes describing the class file structure is read from a Stream object
42
43 class ClassFileParser VALUE_OBJ_CLASS_SPEC {
44 private:
45 bool _need_verify;
46 bool _relax_verify;
47 u2 _major_version;
48 u2 _minor_version;
49 Symbol* _class_name;
50 KlassHandle _host_klass;
51 GrowableArray<Handle>* _cp_patches; // overrides for CP entries
52
53 bool _has_finalizer;
54 bool _has_empty_finalizer;
55 bool _has_vanilla_constructor;
56
57 int _max_bootstrap_specifier_index;
58
59 enum { fixed_buffer_size = 128 };
60 u_char linenumbertable_buffer[fixed_buffer_size];
61
62 ClassFileStream* _stream; // Actual input stream
63
64 enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names
65
66 // Accessors
67 ClassFileStream* stream() { return _stream; }
68 void set_stream(ClassFileStream* st) { _stream = st; }
69
70 // Constant pool parsing
71 void parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS);
72
73 constantPoolHandle parse_constant_pool(TRAPS);
74
75 // Interface parsing
76 objArrayHandle parse_interfaces(constantPoolHandle cp,
77 int length,
78 Handle class_loader,
79 Handle protection_domain,
80 Symbol* class_name,
81 TRAPS);
82
83 // Field parsing
84 void parse_field_attributes(constantPoolHandle cp, u2 attributes_count,
85 bool is_static, u2 signature_index,
86 u2* constantvalue_index_addr,
87 bool* is_synthetic_addr,
88 u2* generic_signature_index_addr,
89 typeArrayHandle* field_annotations, TRAPS);
90 typeArrayHandle parse_fields(Symbol* class_name,
91 constantPoolHandle cp, bool is_interface,
92 FieldAllocationCount *fac,
93 objArrayHandle* fields_annotations,
94 int* java_fields_count_ptr, TRAPS);
95
96 // Method parsing
97 methodHandle parse_method(constantPoolHandle cp, bool is_interface,
98 AccessFlags* promoted_flags,
99 typeArrayHandle* method_annotations,
100 typeArrayHandle* method_parameter_annotations,
101 typeArrayHandle* method_default_annotations,
102 TRAPS);
103 objArrayHandle parse_methods (constantPoolHandle cp, bool is_interface,
104 AccessFlags* promoted_flags,
105 bool* has_final_method,
106 objArrayOop* methods_annotations_oop,
107 objArrayOop* methods_parameter_annotations_oop,
108 objArrayOop* methods_default_annotations_oop,
109 TRAPS);
110 typeArrayHandle sort_methods (objArrayHandle methods,
111 objArrayHandle methods_annotations,
112 objArrayHandle methods_parameter_annotations,
113 objArrayHandle methods_default_annotations,
114 TRAPS);
115 typeArrayHandle parse_exception_table(u4 code_length, u4 exception_table_length,
116 constantPoolHandle cp, TRAPS);
117 void parse_linenumber_table(
118 u4 code_attribute_length, u4 code_length,
119 CompressedLineNumberWriteStream** write_stream, TRAPS);
120 u2* parse_localvariable_table(u4 code_length, u2 max_locals, u4 code_attribute_length,
121 constantPoolHandle cp, u2* localvariable_table_length,
122 bool isLVTT, TRAPS);
123 u2* parse_checked_exceptions(u2* checked_exceptions_length, u4 method_attribute_length,
124 constantPoolHandle cp, TRAPS);
125 void parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
126 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS);
127 typeArrayOop parse_stackmap_table(u4 code_attribute_length, TRAPS);
128
129 // Classfile attribute parsing
130 void parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
131 void parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
132 instanceKlassHandle k, int length, TRAPS);
133 u2 parse_classfile_inner_classes_attribute(constantPoolHandle cp,
134 instanceKlassHandle k, TRAPS);
135 void parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
136 void parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
137 void parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
138 void parse_classfile_bootstrap_methods_attribute(constantPoolHandle cp, instanceKlassHandle k, u4 attribute_length, TRAPS);
139
140 // Annotations handling
141 typeArrayHandle assemble_annotations(u1* runtime_visible_annotations,
142 int runtime_visible_annotations_length,
143 u1* runtime_invisible_annotations,
144 int runtime_invisible_annotations_length, TRAPS);
145
146 // Final setup
147 unsigned int compute_oop_map_count(instanceKlassHandle super,
148 unsigned int nonstatic_oop_count,
149 int first_nonstatic_oop_offset);
150 void fill_oop_maps(instanceKlassHandle k,
151 unsigned int nonstatic_oop_map_count,
152 int* nonstatic_oop_offsets,
153 unsigned int* nonstatic_oop_counts);
154 void set_precomputed_flags(instanceKlassHandle k);
155 objArrayHandle compute_transitive_interfaces(instanceKlassHandle super,
156 objArrayHandle local_ifs, TRAPS);
157
158 // Format checker methods
159 void classfile_parse_error(const char* msg, TRAPS);
160 void classfile_parse_error(const char* msg, int index, TRAPS);
161 void classfile_parse_error(const char* msg, const char *name, TRAPS);
162 void classfile_parse_error(const char* msg, int index, const char *name, TRAPS);
163 inline void guarantee_property(bool b, const char* msg, TRAPS) {
164 if (!b) { classfile_parse_error(msg, CHECK); }
165 }
166
167 inline void assert_property(bool b, const char* msg, TRAPS) {
168 #ifdef ASSERT
169 if (!b) { fatal(msg); }
170 #endif
171 }
172
173 inline void check_property(bool property, const char* msg, int index, TRAPS) {
174 if (_need_verify) {
175 guarantee_property(property, msg, index, CHECK);
176 } else {
177 assert_property(property, msg, CHECK);
178 }
179 }
180
181 inline void check_property(bool property, const char* msg, TRAPS) {
182 if (_need_verify) {
183 guarantee_property(property, msg, CHECK);
184 } else {
185 assert_property(property, msg, CHECK);
186 }
187 }
188
189 inline void guarantee_property(bool b, const char* msg, int index, TRAPS) {
190 if (!b) { classfile_parse_error(msg, index, CHECK); }
191 }
192 inline void guarantee_property(bool b, const char* msg, const char *name, TRAPS) {
193 if (!b) { classfile_parse_error(msg, name, CHECK); }
194 }
195 inline void guarantee_property(bool b, const char* msg, int index, const char *name, TRAPS) {
196 if (!b) { classfile_parse_error(msg, index, name, CHECK); }
197 }
198
199 void throwIllegalSignature(
200 const char* type, Symbol* name, Symbol* sig, TRAPS);
201
202 bool is_supported_version(u2 major, u2 minor);
203 bool has_illegal_visibility(jint flags);
204
205 void verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS);
206 void verify_legal_utf8(const unsigned char* buffer, int length, TRAPS);
207 void verify_legal_class_name(Symbol* name, TRAPS);
208 void verify_legal_field_name(Symbol* name, TRAPS);
209 void verify_legal_method_name(Symbol* name, TRAPS);
210 void verify_legal_field_signature(Symbol* fieldname, Symbol* signature, TRAPS);
211 int verify_legal_method_signature(Symbol* methodname, Symbol* signature, TRAPS);
212 void verify_legal_class_modifiers(jint flags, TRAPS);
213 void verify_legal_field_modifiers(jint flags, bool is_interface, TRAPS);
214 void verify_legal_method_modifiers(jint flags, bool is_interface, Symbol* name, TRAPS);
215 bool verify_unqualified_name(char* name, unsigned int length, int type);
216 char* skip_over_field_name(char* name, bool slash_ok, unsigned int length);
217 char* skip_over_field_signature(char* signature, bool void_ok, unsigned int length, TRAPS);
218
219 bool is_anonymous() {
220 assert(EnableInvokeDynamic || _host_klass.is_null(), "");
221 return _host_klass.not_null();
222 }
223 bool has_cp_patch_at(int index) {
224 assert(EnableInvokeDynamic, "");
225 assert(index >= 0, "oob");
226 return (_cp_patches != NULL
227 && index < _cp_patches->length()
228 && _cp_patches->adr_at(index)->not_null());
229 }
230 Handle cp_patch_at(int index) {
231 assert(has_cp_patch_at(index), "oob");
232 return _cp_patches->at(index);
233 }
234 Handle clear_cp_patch_at(int index) {
235 Handle patch = cp_patch_at(index);
236 _cp_patches->at_put(index, Handle());
237 assert(!has_cp_patch_at(index), "");
238 return patch;
239 }
240 void patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS);
241
242 // Wrapper for constantTag.is_klass_[or_]reference.
243 // In older versions of the VM, klassOops cannot sneak into early phases of
244 // constant pool construction, but in later versions they can.
245 // %%% Let's phase out the old is_klass_reference.
246 bool is_klass_reference(constantPoolHandle cp, int index) {
247 return ((LinkWellKnownClasses || EnableInvokeDynamic)
248 ? cp->tag_at(index).is_klass_or_reference()
249 : cp->tag_at(index).is_klass_reference());
250 }
251
252 public:
253 // Constructor
254 ClassFileParser(ClassFileStream* st) { set_stream(st); }
255
256 // Parse .class file and return new klassOop. The klassOop is not hooked up
257 // to the system dictionary or any other structures, so a .class file can
258 // be loaded several times if desired.
259 // The system dictionary hookup is done by the caller.
260 //
261 // "parsed_name" is updated by this method, and is the name found
262 // while parsing the stream.
263 instanceKlassHandle parseClassFile(Symbol* name,
264 Handle class_loader,
265 Handle protection_domain,
266 TempNewSymbol& parsed_name,
267 bool verify,
268 TRAPS) {
269 KlassHandle no_host_klass;
270 return parseClassFile(name, class_loader, protection_domain, no_host_klass, NULL, parsed_name, verify, THREAD);
271 }
272 instanceKlassHandle parseClassFile(Symbol* name,
273 Handle class_loader,
274 Handle protection_domain,
275 KlassHandle host_klass,
276 GrowableArray<Handle>* cp_patches,
277 TempNewSymbol& parsed_name,
278 bool verify,
279 TRAPS);
280
281 // Verifier checks
282 static void check_super_class_access(instanceKlassHandle this_klass, TRAPS);
283 static void check_super_interface_access(instanceKlassHandle this_klass, TRAPS);
284 static void check_final_method_override(instanceKlassHandle this_klass, TRAPS);
285 static void check_illegal_static_method(instanceKlassHandle this_klass, TRAPS);
286 };
287
288 #endif // SHARE_VM_CLASSFILE_CLASSFILEPARSER_HPP