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comparison src/share/vm/classfile/verifier.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1998-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // The verifier class
26 class Verifier : AllStatic {
27 public:
28 enum { STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50 };
29 typedef enum { ThrowException, NoException } Mode;
30
31 /**
32 * Verify the bytecodes for a class. If 'throw_exception' is true
33 * then the appropriate VerifyError or ClassFormatError will be thrown.
34 * Otherwise, no exception is thrown and the return indicates the
35 * error.
36 */
37 static bool verify(instanceKlassHandle klass, Mode mode, TRAPS);
38
39 // Return false if the class is loaded by the bootstrap loader.
40 static bool should_verify_for(oop class_loader);
41
42 // Relax certain verifier checks to enable some broken 1.1 apps to run on 1.2.
43 static bool relax_verify_for(oop class_loader);
44
45 private:
46 static bool is_eligible_for_verification(instanceKlassHandle klass);
47 static symbolHandle inference_verify(
48 instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
49 };
50
51 class RawBytecodeStream;
52 class StackMapFrame;
53 class StackMapTable;
54
55 // Summary of verifier's memory usage:
56 // StackMapTable is stack allocated.
57 // StackMapFrame are resource allocated. There is one ResourceMark
58 // for each method.
59 // There is one mutable StackMapFrame (current_frame) which is updated
60 // by abstract bytecode interpretation. frame_in_exception_handler() returns
61 // a frame that has a mutable one-item stack (ready for pushing the
62 // catch type exception object). All the other StackMapFrame's
63 // are immutable (including their locals and stack arrays) after
64 // their constructions.
65 // locals/stack arrays in StackMapFrame are resource allocated.
66 // locals/stack arrays can be shared between StackMapFrame's, except
67 // the mutable StackMapFrame (current_frame).
68 // Care needs to be taken to make sure resource objects don't outlive
69 // the lifetime of their ResourceMark.
70
71 // These macros are used similarly to CHECK macros but also check
72 // the status of the verifier and return if that has an error.
73 #define CHECK_VERIFY(verifier) \
74 CHECK); if ((verifier)->has_error()) return; (0
75 #define CHECK_VERIFY_(verifier, result) \
76 CHECK_(result)); if ((verifier)->has_error()) return (result); (0
77
78 // A new instance of this class is created for each class being verified
79 class ClassVerifier : public StackObj {
80 private:
81 Thread* _thread;
82 symbolHandle _exception_type;
83 char* _message;
84 size_t _message_buffer_len;
85
86 void verify_method(methodHandle method, TRAPS);
87 char* generate_code_data(methodHandle m, u4 code_length, TRAPS);
88 void verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS);
89 void verify_local_variable_table(u4 code_length, char* code_data, TRAPS);
90
91 VerificationType cp_ref_index_to_type(
92 int index, constantPoolHandle cp, TRAPS) {
93 return cp_index_to_type(cp->klass_ref_index_at(index), cp, THREAD);
94 }
95
96 bool is_protected_access(
97 instanceKlassHandle this_class, klassOop target_class,
98 symbolOop field_name, symbolOop field_sig, bool is_method);
99
100 void verify_cp_index(constantPoolHandle cp, int index, TRAPS);
101 void verify_cp_type(
102 int index, constantPoolHandle cp, unsigned int types, TRAPS);
103 void verify_cp_class_type(int index, constantPoolHandle cp, TRAPS);
104
105 u2 verify_stackmap_table(
106 u2 stackmap_index, u2 bci, StackMapFrame* current_frame,
107 StackMapTable* stackmap_table, bool no_control_flow, TRAPS);
108
109 void verify_exception_handler_targets(
110 u2 bci, bool this_uninit, StackMapFrame* current_frame,
111 StackMapTable* stackmap_table, TRAPS);
112
113 void verify_ldc(
114 int opcode, u2 index, StackMapFrame *current_frame,
115 constantPoolHandle cp, u2 bci, TRAPS);
116
117 void verify_switch(
118 RawBytecodeStream* bcs, u4 code_length, char* code_data,
119 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS);
120
121 void verify_field_instructions(
122 RawBytecodeStream* bcs, StackMapFrame* current_frame,
123 constantPoolHandle cp, TRAPS);
124
125 void verify_invoke_init(
126 RawBytecodeStream* bcs, VerificationType ref_class_type,
127 StackMapFrame* current_frame, u4 code_length, bool* this_uninit,
128 constantPoolHandle cp, TRAPS);
129
130 void verify_invoke_instructions(
131 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
132 bool* this_uninit, VerificationType return_type,
133 constantPoolHandle cp, TRAPS);
134
135 VerificationType get_newarray_type(u2 index, u2 bci, TRAPS);
136 void verify_anewarray(
137 u2 index, constantPoolHandle cp, StackMapFrame* current_frame, TRAPS);
138 void verify_return_value(
139 VerificationType return_type, VerificationType type, u2 offset, TRAPS);
140
141 void verify_iload (u2 index, StackMapFrame* current_frame, TRAPS);
142 void verify_lload (u2 index, StackMapFrame* current_frame, TRAPS);
143 void verify_fload (u2 index, StackMapFrame* current_frame, TRAPS);
144 void verify_dload (u2 index, StackMapFrame* current_frame, TRAPS);
145 void verify_aload (u2 index, StackMapFrame* current_frame, TRAPS);
146 void verify_istore(u2 index, StackMapFrame* current_frame, TRAPS);
147 void verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS);
148 void verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS);
149 void verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS);
150 void verify_astore(u2 index, StackMapFrame* current_frame, TRAPS);
151 void verify_iinc (u2 index, StackMapFrame* current_frame, TRAPS);
152
153 bool name_in_supers(symbolOop ref_name, instanceKlassHandle current);
154
155 instanceKlassHandle _klass; // the class being verified
156 methodHandle _method; // current method being verified
157 VerificationType _this_type; // the verification type of the current class
158
159 public:
160 enum {
161 BYTECODE_OFFSET = 1,
162 NEW_OFFSET = 2
163 };
164
165 // constructor
166 ClassVerifier(instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
167
168 // destructor
169 ~ClassVerifier();
170
171 Thread* thread() { return _thread; }
172 methodHandle method() { return _method; }
173 instanceKlassHandle current_class() const { return _klass; }
174 VerificationType current_type() const { return _this_type; }
175
176 // Verifies the class. If a verify or class file format error occurs,
177 // the '_exception_name' symbols will set to the exception name and
178 // the message_buffer will be filled in with the exception message.
179 void verify_class(TRAPS);
180
181 // Return status modes
182 symbolHandle result() const { return _exception_type; }
183 bool has_error() const { return !(result().is_null()); }
184
185 // Called when verify or class format errors are encountered.
186 // May throw an exception based upon the mode.
187 void verify_error(u2 offset, const char* fmt, ...);
188 void verify_error(const char* fmt, ...);
189 void class_format_error(const char* fmt, ...);
190 void format_error_message(const char* fmt, int offset, va_list args);
191
192 klassOop load_class(symbolHandle name, TRAPS);
193
194 int change_sig_to_verificationType(
195 SignatureStream* sig_type, VerificationType* inference_type, TRAPS);
196
197 VerificationType cp_index_to_type(int index, constantPoolHandle cp, TRAPS) {
198 return VerificationType::reference_type(
199 symbolHandle(THREAD, cp->klass_name_at(index)));
200 }
201
202 static bool _verify_verbose; // for debugging
203 };
204
205 inline int ClassVerifier::change_sig_to_verificationType(
206 SignatureStream* sig_type, VerificationType* inference_type, TRAPS) {
207 BasicType bt = sig_type->type();
208 switch (bt) {
209 case T_OBJECT:
210 case T_ARRAY:
211 {
212 symbolOop name = sig_type->as_symbol(CHECK_0);
213 *inference_type =
214 VerificationType::reference_type(symbolHandle(THREAD, name));
215 return 1;
216 }
217 case T_LONG:
218 *inference_type = VerificationType::long_type();
219 *++inference_type = VerificationType::long2_type();
220 return 2;
221 case T_DOUBLE:
222 *inference_type = VerificationType::double_type();
223 *++inference_type = VerificationType::double2_type();
224 return 2;
225 case T_INT:
226 case T_BOOLEAN:
227 case T_BYTE:
228 case T_CHAR:
229 case T_SHORT:
230 *inference_type = VerificationType::integer_type();
231 return 1;
232 case T_FLOAT:
233 *inference_type = VerificationType::float_type();
234 return 1;
235 default:
236 ShouldNotReachHere();
237 return 1;
238 }
239 }