verifier.hpp revision 2062:3582bf76420e
1/* 2 * Copyright (c) 1998, 2010, 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_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 35// The verifier class 36class Verifier : AllStatic { 37 public: 38 enum { 39 STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50, 40 INVOKEDYNAMIC_MAJOR_VERSION = 51 41 }; 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 */ 50 static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS); 51 52 // Return false if the class is loaded by the bootstrap loader, 53 // or if defineClass was called requesting skipping verification 54 // -Xverify:all/none override this value 55 static bool should_verify_for(oop class_loader, bool should_verify_class); 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: 61 static bool is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class); 62 static Symbol* inference_verify( 63 instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS); 64}; 65 66class RawBytecodeStream; 67class StackMapFrame; 68class StackMapTable; 69 70// Summary of verifier's memory usage: 71// StackMapTable is stack allocated. 72// StackMapFrame are resource allocated. There is only one ResourceMark 73// for each class verification, which is created at the top level. 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 92class ClassVerifier : public StackObj { 93 private: 94 Thread* _thread; 95 Symbol* _exception_type; 96 char* _message; 97 size_t _message_buffer_len; 98 GrowableArray<Symbol*>* _symbols; // keep a list of symbols created 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, 112 Symbol* field_name, Symbol* field_sig, bool is_method); 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); 166 167 bool name_in_supers(Symbol* ref_name, instanceKlassHandle current); 168 169 VerificationType object_type() const; 170 171 instanceKlassHandle _klass; // the class being verified 172 methodHandle _method; // current method being verified 173 VerificationType _this_type; // the verification type of the current class 174 175 // 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(); } 184 185 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 208 Symbol* result() const { return _exception_type; } 209 bool has_error() const { return result() != NULL; } 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); 217 218 klassOop load_class(Symbol* name, TRAPS); 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) { 224 return VerificationType::reference_type(cp->klass_name_at(index)); 225 } 226 227 // Keep a list of temporary symbols created during verification because 228 // their reference counts need to be decrememented when the verifier object 229 // goes out of scope. Since these symbols escape the scope in which they're 230 // created, we can't use a TempNewSymbol. 231 Symbol* create_temporary_symbol(const Symbol* s, int begin, int end, TRAPS); 232 Symbol* create_temporary_symbol(const char *s, int length, TRAPS); 233 234 static bool _verify_verbose; // for debugging 235}; 236 237inline 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 { 244 Symbol* name = sig_type->as_symbol(CHECK_0); 245 // Create another symbol to save as signature stream unreferences 246 // this symbol. 247 Symbol* name_copy = 248 create_temporary_symbol(name, 0, name->utf8_length(), CHECK_0); 249 assert(name_copy == name, "symbols don't match"); 250 *inference_type = 251 VerificationType::reference_type(name_copy); 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} 277 278#endif // SHARE_VM_CLASSFILE_VERIFIER_HPP 279