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annotate src/share/vm/classfile/verifier.hpp @ 3763:e66f38dd58a9
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CLASSFILE_VERIFIER_HPP |
26 #define SHARE_VM_CLASSFILE_VERIFIER_HPP | |
27 | |
28 #include "classfile/verificationType.hpp" | |
29 #include "memory/gcLocker.hpp" | |
30 #include "oops/klass.hpp" | |
31 #include "oops/methodOop.hpp" | |
32 #include "runtime/handles.hpp" | |
33 #include "utilities/exceptions.hpp" | |
34 | |
0 | 35 // The verifier class |
36 class Verifier : AllStatic { | |
37 public: | |
1602 | 38 enum { |
39 STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50, | |
40 INVOKEDYNAMIC_MAJOR_VERSION = 51 | |
41 }; | |
0 | 42 typedef enum { ThrowException, NoException } Mode; |
43 | |
44 /** | |
45 * Verify the bytecodes for a class. If 'throw_exception' is true | |
46 * then the appropriate VerifyError or ClassFormatError will be thrown. | |
47 * Otherwise, no exception is thrown and the return indicates the | |
48 * error. | |
49 */ | |
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50 static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS); |
0 | 51 |
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52 // Return false if the class is loaded by the bootstrap loader, |
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53 // or if defineClass was called requesting skipping verification |
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54 // -Xverify:all/none override this value |
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55 static bool should_verify_for(oop class_loader, bool should_verify_class); |
0 | 56 |
57 // Relax certain verifier checks to enable some broken 1.1 apps to run on 1.2. | |
58 static bool relax_verify_for(oop class_loader); | |
59 | |
60 private: | |
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61 static bool is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class); |
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62 static Symbol* inference_verify( |
0 | 63 instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS); |
64 }; | |
65 | |
66 class RawBytecodeStream; | |
67 class StackMapFrame; | |
68 class StackMapTable; | |
69 | |
70 // Summary of verifier's memory usage: | |
71 // StackMapTable is stack allocated. | |
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72 // StackMapFrame are resource allocated. There is only one ResourceMark |
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73 // for each class verification, which is created at the top level. |
0 | 74 // There is one mutable StackMapFrame (current_frame) which is updated |
75 // by abstract bytecode interpretation. frame_in_exception_handler() returns | |
76 // a frame that has a mutable one-item stack (ready for pushing the | |
77 // catch type exception object). All the other StackMapFrame's | |
78 // are immutable (including their locals and stack arrays) after | |
79 // their constructions. | |
80 // locals/stack arrays in StackMapFrame are resource allocated. | |
81 // locals/stack arrays can be shared between StackMapFrame's, except | |
82 // the mutable StackMapFrame (current_frame). | |
83 | |
84 // These macros are used similarly to CHECK macros but also check | |
85 // the status of the verifier and return if that has an error. | |
86 #define CHECK_VERIFY(verifier) \ | |
87 CHECK); if ((verifier)->has_error()) return; (0 | |
88 #define CHECK_VERIFY_(verifier, result) \ | |
89 CHECK_(result)); if ((verifier)->has_error()) return (result); (0 | |
90 | |
91 // A new instance of this class is created for each class being verified | |
92 class ClassVerifier : public StackObj { | |
93 private: | |
94 Thread* _thread; | |
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95 Symbol* _exception_type; |
0 | 96 char* _message; |
97 size_t _message_buffer_len; | |
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98 GrowableArray<Symbol*>* _symbols; // keep a list of symbols created |
0 | 99 |
100 void verify_method(methodHandle method, TRAPS); | |
101 char* generate_code_data(methodHandle m, u4 code_length, TRAPS); | |
102 void verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS); | |
103 void verify_local_variable_table(u4 code_length, char* code_data, TRAPS); | |
104 | |
105 VerificationType cp_ref_index_to_type( | |
106 int index, constantPoolHandle cp, TRAPS) { | |
107 return cp_index_to_type(cp->klass_ref_index_at(index), cp, THREAD); | |
108 } | |
109 | |
110 bool is_protected_access( | |
111 instanceKlassHandle this_class, klassOop target_class, | |
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112 Symbol* field_name, Symbol* field_sig, bool is_method); |
0 | 113 |
114 void verify_cp_index(constantPoolHandle cp, int index, TRAPS); | |
115 void verify_cp_type( | |
116 int index, constantPoolHandle cp, unsigned int types, TRAPS); | |
117 void verify_cp_class_type(int index, constantPoolHandle cp, TRAPS); | |
118 | |
119 u2 verify_stackmap_table( | |
120 u2 stackmap_index, u2 bci, StackMapFrame* current_frame, | |
121 StackMapTable* stackmap_table, bool no_control_flow, TRAPS); | |
122 | |
123 void verify_exception_handler_targets( | |
124 u2 bci, bool this_uninit, StackMapFrame* current_frame, | |
125 StackMapTable* stackmap_table, TRAPS); | |
126 | |
127 void verify_ldc( | |
128 int opcode, u2 index, StackMapFrame *current_frame, | |
129 constantPoolHandle cp, u2 bci, TRAPS); | |
130 | |
131 void verify_switch( | |
132 RawBytecodeStream* bcs, u4 code_length, char* code_data, | |
133 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS); | |
134 | |
135 void verify_field_instructions( | |
136 RawBytecodeStream* bcs, StackMapFrame* current_frame, | |
137 constantPoolHandle cp, TRAPS); | |
138 | |
139 void verify_invoke_init( | |
140 RawBytecodeStream* bcs, VerificationType ref_class_type, | |
141 StackMapFrame* current_frame, u4 code_length, bool* this_uninit, | |
142 constantPoolHandle cp, TRAPS); | |
143 | |
144 void verify_invoke_instructions( | |
145 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame, | |
146 bool* this_uninit, VerificationType return_type, | |
147 constantPoolHandle cp, TRAPS); | |
148 | |
149 VerificationType get_newarray_type(u2 index, u2 bci, TRAPS); | |
150 void verify_anewarray( | |
151 u2 index, constantPoolHandle cp, StackMapFrame* current_frame, TRAPS); | |
152 void verify_return_value( | |
153 VerificationType return_type, VerificationType type, u2 offset, TRAPS); | |
154 | |
155 void verify_iload (u2 index, StackMapFrame* current_frame, TRAPS); | |
156 void verify_lload (u2 index, StackMapFrame* current_frame, TRAPS); | |
157 void verify_fload (u2 index, StackMapFrame* current_frame, TRAPS); | |
158 void verify_dload (u2 index, StackMapFrame* current_frame, TRAPS); | |
159 void verify_aload (u2 index, StackMapFrame* current_frame, TRAPS); | |
160 void verify_istore(u2 index, StackMapFrame* current_frame, TRAPS); | |
161 void verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS); | |
162 void verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS); | |
163 void verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS); | |
164 void verify_astore(u2 index, StackMapFrame* current_frame, TRAPS); | |
165 void verify_iinc (u2 index, StackMapFrame* current_frame, TRAPS); | |
166 | |
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167 bool name_in_supers(Symbol* ref_name, instanceKlassHandle current); |
0 | 168 |
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169 VerificationType object_type() const; |
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170 |
0 | 171 instanceKlassHandle _klass; // the class being verified |
172 methodHandle _method; // current method being verified | |
173 VerificationType _this_type; // the verification type of the current class | |
174 | |
1570 | 175 // Some recursive calls from the verifier to the name resolver |
176 // can cause the current class to be re-verified and rewritten. | |
177 // If this happens, the original verification should not continue, | |
178 // because constant pool indexes will have changed. | |
179 // The rewriter is preceded by the verifier. If the verifier throws | |
180 // an error, rewriting is prevented. Also, rewriting always precedes | |
181 // bytecode execution or compilation. Thus, is_rewritten implies | |
182 // that a class has been verified and prepared for execution. | |
183 bool was_recursively_verified() { return _klass->is_rewritten(); } | |
184 | |
0 | 185 public: |
186 enum { | |
187 BYTECODE_OFFSET = 1, | |
188 NEW_OFFSET = 2 | |
189 }; | |
190 | |
191 // constructor | |
192 ClassVerifier(instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS); | |
193 | |
194 // destructor | |
195 ~ClassVerifier(); | |
196 | |
197 Thread* thread() { return _thread; } | |
198 methodHandle method() { return _method; } | |
199 instanceKlassHandle current_class() const { return _klass; } | |
200 VerificationType current_type() const { return _this_type; } | |
201 | |
202 // Verifies the class. If a verify or class file format error occurs, | |
203 // the '_exception_name' symbols will set to the exception name and | |
204 // the message_buffer will be filled in with the exception message. | |
205 void verify_class(TRAPS); | |
206 | |
207 // Return status modes | |
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208 Symbol* result() const { return _exception_type; } |
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209 bool has_error() const { return result() != NULL; } |
0 | 210 |
211 // Called when verify or class format errors are encountered. | |
212 // May throw an exception based upon the mode. | |
213 void verify_error(u2 offset, const char* fmt, ...); | |
214 void verify_error(const char* fmt, ...); | |
215 void class_format_error(const char* fmt, ...); | |
216 void format_error_message(const char* fmt, int offset, va_list args); | |
217 | |
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218 klassOop load_class(Symbol* name, TRAPS); |
0 | 219 |
220 int change_sig_to_verificationType( | |
221 SignatureStream* sig_type, VerificationType* inference_type, TRAPS); | |
222 | |
223 VerificationType cp_index_to_type(int index, constantPoolHandle cp, TRAPS) { | |
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224 return VerificationType::reference_type(cp->klass_name_at(index)); |
0 | 225 } |
226 | |
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227 // Keep a list of temporary symbols created during verification because |
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228 // their reference counts need to be decrememented when the verifier object |
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229 // goes out of scope. Since these symbols escape the scope in which they're |
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230 // created, we can't use a TempNewSymbol. |
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231 Symbol* create_temporary_symbol(const Symbol* s, int begin, int end, TRAPS); |
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232 Symbol* create_temporary_symbol(const char *s, int length, TRAPS); |
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233 |
0 | 234 static bool _verify_verbose; // for debugging |
235 }; | |
236 | |
237 inline int ClassVerifier::change_sig_to_verificationType( | |
238 SignatureStream* sig_type, VerificationType* inference_type, TRAPS) { | |
239 BasicType bt = sig_type->type(); | |
240 switch (bt) { | |
241 case T_OBJECT: | |
242 case T_ARRAY: | |
243 { | |
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244 Symbol* name = sig_type->as_symbol(CHECK_0); |
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245 // Create another symbol to save as signature stream unreferences |
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246 // this symbol. |
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247 Symbol* name_copy = |
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248 create_temporary_symbol(name, 0, name->utf8_length(), CHECK_0); |
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249 assert(name_copy == name, "symbols don't match"); |
0 | 250 *inference_type = |
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251 VerificationType::reference_type(name_copy); |
0 | 252 return 1; |
253 } | |
254 case T_LONG: | |
255 *inference_type = VerificationType::long_type(); | |
256 *++inference_type = VerificationType::long2_type(); | |
257 return 2; | |
258 case T_DOUBLE: | |
259 *inference_type = VerificationType::double_type(); | |
260 *++inference_type = VerificationType::double2_type(); | |
261 return 2; | |
262 case T_INT: | |
263 case T_BOOLEAN: | |
264 case T_BYTE: | |
265 case T_CHAR: | |
266 case T_SHORT: | |
267 *inference_type = VerificationType::integer_type(); | |
268 return 1; | |
269 case T_FLOAT: | |
270 *inference_type = VerificationType::float_type(); | |
271 return 1; | |
272 default: | |
273 ShouldNotReachHere(); | |
274 return 1; | |
275 } | |
276 } | |
1972 | 277 |
278 #endif // SHARE_VM_CLASSFILE_VERIFIER_HPP |