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| 1 | +/* | |
| 2 | + * Copyright (c) 2001, 2008, 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.reflect; | |
| 27 | + | |
| 28 | +import java.lang.reflect.*; | |
| 29 | +import java.security.AccessController; | |
| 30 | +import java.security.PrivilegedAction; | |
| 31 | +import sun.misc.Unsafe; | |
| 32 | + | |
| 33 | +/** Generator for sun.reflect.MethodAccessor and | |
| 34 | + sun.reflect.ConstructorAccessor objects using bytecodes to | |
| 35 | + implement reflection. A java.lang.reflect.Method or | |
| 36 | + java.lang.reflect.Constructor object can delegate its invoke or | |
| 37 | + newInstance method to an accessor using native code or to one | |
| 38 | + generated by this class. (Methods and Constructors were merged | |
| 39 | + together in this class to ensure maximum code sharing.) */ | |
| 40 | + | |
| 41 | +class MethodAccessorGenerator extends AccessorGenerator { | |
| 42 | + | |
| 43 | + private static final short NUM_BASE_CPOOL_ENTRIES = (short) 12; | |
| 44 | + // One for invoke() plus one for constructor | |
| 45 | + private static final short NUM_METHODS = (short) 2; | |
| 46 | + // Only used if forSerialization is true | |
| 47 | + private static final short NUM_SERIALIZATION_CPOOL_ENTRIES = (short) 2; | |
| 48 | + | |
| 49 | + private static volatile int methodSymnum = 0; | |
| 50 | + private static volatile int constructorSymnum = 0; | |
| 51 | + private static volatile int serializationConstructorSymnum = 0; | |
| 52 | + | |
| 53 | + private Class declaringClass; | |
| 54 | + private Class[] parameterTypes; | |
| 55 | + private Class returnType; | |
| 56 | + private boolean isConstructor; | |
| 57 | + private boolean forSerialization; | |
| 58 | + | |
| 59 | + private short targetMethodRef; | |
| 60 | + private short invokeIdx; | |
| 61 | + private short invokeDescriptorIdx; | |
| 62 | + // Constant pool index of CONSTANT_Class_info for first | |
| 63 | + // non-primitive parameter type. Should be incremented by 2. | |
| 64 | + private short nonPrimitiveParametersBaseIdx; | |
| 65 | + | |
| 66 | + MethodAccessorGenerator() { | |
| 67 | + } | |
| 68 | + | |
| 69 | + /** This routine is not thread-safe */ | |
| 70 | + public MethodAccessor generateMethod(Class declaringClass, | |
| 71 | + String name, | |
| 72 | + Class[] parameterTypes, | |
| 73 | + Class returnType, | |
| 74 | + Class[] checkedExceptions, | |
| 75 | + int modifiers) | |
| 76 | + { | |
| 77 | + return (MethodAccessor) generate(declaringClass, | |
| 78 | + name, | |
| 79 | + parameterTypes, | |
| 80 | + returnType, | |
| 81 | + checkedExceptions, | |
| 82 | + modifiers, | |
| 83 | + false, | |
| 84 | + false, | |
| 85 | + null); | |
| 86 | + } | |
| 87 | + | |
| 88 | + /** This routine is not thread-safe */ | |
| 89 | + public ConstructorAccessor generateConstructor(Class declaringClass, | |
| 90 | + Class[] parameterTypes, | |
| 91 | + Class[] checkedExceptions, | |
| 92 | + int modifiers) | |
| 93 | + { | |
| 94 | + return (ConstructorAccessor) generate(declaringClass, | |
| 95 | + "<init>", | |
| 96 | + parameterTypes, | |
| 97 | + Void.TYPE, | |
| 98 | + checkedExceptions, | |
| 99 | + modifiers, | |
| 100 | + true, | |
| 101 | + false, | |
| 102 | + null); | |
| 103 | + } | |
| 104 | + | |
| 105 | + /** This routine is not thread-safe */ | |
| 106 | + public SerializationConstructorAccessorImpl | |
| 107 | + generateSerializationConstructor(Class declaringClass, | |
| 108 | + Class[] parameterTypes, | |
| 109 | + Class[] checkedExceptions, | |
| 110 | + int modifiers, | |
| 111 | + Class targetConstructorClass) | |
| 112 | + { | |
| 113 | + return (SerializationConstructorAccessorImpl) | |
| 114 | + generate(declaringClass, | |
| 115 | + "<init>", | |
| 116 | + parameterTypes, | |
| 117 | + Void.TYPE, | |
| 118 | + checkedExceptions, | |
| 119 | + modifiers, | |
| 120 | + true, | |
| 121 | + true, | |
| 122 | + targetConstructorClass); | |
| 123 | + } | |
| 124 | + | |
| 125 | + /** This routine is not thread-safe */ | |
| 126 | + private MagicAccessorImpl generate(final Class declaringClass, | |
| 127 | + String name, | |
| 128 | + Class[] parameterTypes, | |
| 129 | + Class returnType, | |
| 130 | + Class[] checkedExceptions, | |
| 131 | + int modifiers, | |
| 132 | + boolean isConstructor, | |
| 133 | + boolean forSerialization, | |
| 134 | + Class serializationTargetClass) | |
| 135 | + { | |
| 136 | + ByteVector vec = ByteVectorFactory.create(); | |
| 137 | + asm = new ClassFileAssembler(vec); | |
| 138 | + this.declaringClass = declaringClass; | |
| 139 | + this.parameterTypes = parameterTypes; | |
| 140 | + this.returnType = returnType; | |
| 141 | + this.modifiers = modifiers; | |
| 142 | + this.isConstructor = isConstructor; | |
| 143 | + this.forSerialization = forSerialization; | |
| 144 | + | |
| 145 | + asm.emitMagicAndVersion(); | |
| 146 | + | |
| 147 | + // Constant pool entries: | |
| 148 | + // ( * = Boxing information: optional) | |
| 149 | + // (+ = Shared entries provided by AccessorGenerator) | |
| 150 | + // (^ = Only present if generating SerializationConstructorAccessor) | |
| 151 | + // [UTF-8] [This class's name] | |
| 152 | + // [CONSTANT_Class_info] for above | |
| 153 | + // [UTF-8] "sun/reflect/{MethodAccessorImpl,ConstructorAccessorImpl,SerializationConstructorAccessorImpl}" | |
| 154 | + // [CONSTANT_Class_info] for above | |
| 155 | + // [UTF-8] [Target class's name] | |
| 156 | + // [CONSTANT_Class_info] for above | |
| 157 | + // ^ [UTF-8] [Serialization: Class's name in which to invoke constructor] | |
| 158 | + // ^ [CONSTANT_Class_info] for above | |
| 159 | + // [UTF-8] target method or constructor name | |
| 160 | + // [UTF-8] target method or constructor signature | |
| 161 | + // [CONSTANT_NameAndType_info] for above | |
| 162 | + // [CONSTANT_Methodref_info or CONSTANT_InterfaceMethodref_info] for target method | |
| 163 | + // [UTF-8] "invoke" or "newInstance" | |
| 164 | + // [UTF-8] invoke or newInstance descriptor | |
| 165 | + // [UTF-8] descriptor for type of non-primitive parameter 1 | |
| 166 | + // [CONSTANT_Class_info] for type of non-primitive parameter 1 | |
| 167 | + // ... | |
| 168 | + // [UTF-8] descriptor for type of non-primitive parameter n | |
| 169 | + // [CONSTANT_Class_info] for type of non-primitive parameter n | |
| 170 | + // + [UTF-8] "java/lang/Exception" | |
| 171 | + // + [CONSTANT_Class_info] for above | |
| 172 | + // + [UTF-8] "java/lang/ClassCastException" | |
| 173 | + // + [CONSTANT_Class_info] for above | |
| 174 | + // + [UTF-8] "java/lang/NullPointerException" | |
| 175 | + // + [CONSTANT_Class_info] for above | |
| 176 | + // + [UTF-8] "java/lang/IllegalArgumentException" | |
| 177 | + // + [CONSTANT_Class_info] for above | |
| 178 | + // + [UTF-8] "java/lang/InvocationTargetException" | |
| 179 | + // + [CONSTANT_Class_info] for above | |
| 180 | + // + [UTF-8] "<init>" | |
| 181 | + // + [UTF-8] "()V" | |
| 182 | + // + [CONSTANT_NameAndType_info] for above | |
| 183 | + // + [CONSTANT_Methodref_info] for NullPointerException's constructor | |
| 184 | + // + [CONSTANT_Methodref_info] for IllegalArgumentException's constructor | |
| 185 | + // + [UTF-8] "(Ljava/lang/String;)V" | |
| 186 | + // + [CONSTANT_NameAndType_info] for "<init>(Ljava/lang/String;)V" | |
| 187 | + // + [CONSTANT_Methodref_info] for IllegalArgumentException's constructor taking a String | |
| 188 | + // + [UTF-8] "(Ljava/lang/Throwable;)V" | |
| 189 | + // + [CONSTANT_NameAndType_info] for "<init>(Ljava/lang/Throwable;)V" | |
| 190 | + // + [CONSTANT_Methodref_info] for InvocationTargetException's constructor | |
| 191 | + // + [CONSTANT_Methodref_info] for "super()" | |
| 192 | + // + [UTF-8] "java/lang/Object" | |
| 193 | + // + [CONSTANT_Class_info] for above | |
| 194 | + // + [UTF-8] "toString" | |
| 195 | + // + [UTF-8] "()Ljava/lang/String;" | |
| 196 | + // + [CONSTANT_NameAndType_info] for "toString()Ljava/lang/String;" | |
| 197 | + // + [CONSTANT_Methodref_info] for Object's toString method | |
| 198 | + // + [UTF-8] "Code" | |
| 199 | + // + [UTF-8] "Exceptions" | |
| 200 | + // * [UTF-8] "java/lang/Boolean" | |
| 201 | + // * [CONSTANT_Class_info] for above | |
| 202 | + // * [UTF-8] "(Z)V" | |
| 203 | + // * [CONSTANT_NameAndType_info] for above | |
| 204 | + // * [CONSTANT_Methodref_info] for above | |
| 205 | + // * [UTF-8] "booleanValue" | |
| 206 | + // * [UTF-8] "()Z" | |
| 207 | + // * [CONSTANT_NameAndType_info] for above | |
| 208 | + // * [CONSTANT_Methodref_info] for above | |
| 209 | + // * [UTF-8] "java/lang/Byte" | |
| 210 | + // * [CONSTANT_Class_info] for above | |
| 211 | + // * [UTF-8] "(B)V" | |
| 212 | + // * [CONSTANT_NameAndType_info] for above | |
| 213 | + // * [CONSTANT_Methodref_info] for above | |
| 214 | + // * [UTF-8] "byteValue" | |
| 215 | + // * [UTF-8] "()B" | |
| 216 | + // * [CONSTANT_NameAndType_info] for above | |
| 217 | + // * [CONSTANT_Methodref_info] for above | |
| 218 | + // * [UTF-8] "java/lang/Character" | |
| 219 | + // * [CONSTANT_Class_info] for above | |
| 220 | + // * [UTF-8] "(C)V" | |
| 221 | + // * [CONSTANT_NameAndType_info] for above | |
| 222 | + // * [CONSTANT_Methodref_info] for above | |
| 223 | + // * [UTF-8] "charValue" | |
| 224 | + // * [UTF-8] "()C" | |
| 225 | + // * [CONSTANT_NameAndType_info] for above | |
| 226 | + // * [CONSTANT_Methodref_info] for above | |
| 227 | + // * [UTF-8] "java/lang/Double" | |
| 228 | + // * [CONSTANT_Class_info] for above | |
| 229 | + // * [UTF-8] "(D)V" | |
| 230 | + // * [CONSTANT_NameAndType_info] for above | |
| 231 | + // * [CONSTANT_Methodref_info] for above | |
| 232 | + // * [UTF-8] "doubleValue" | |
| 233 | + // * [UTF-8] "()D" | |
| 234 | + // * [CONSTANT_NameAndType_info] for above | |
| 235 | + // * [CONSTANT_Methodref_info] for above | |
| 236 | + // * [UTF-8] "java/lang/Float" | |
| 237 | + // * [CONSTANT_Class_info] for above | |
| 238 | + // * [UTF-8] "(F)V" | |
| 239 | + // * [CONSTANT_NameAndType_info] for above | |
| 240 | + // * [CONSTANT_Methodref_info] for above | |
| 241 | + // * [UTF-8] "floatValue" | |
| 242 | + // * [UTF-8] "()F" | |
| 243 | + // * [CONSTANT_NameAndType_info] for above | |
| 244 | + // * [CONSTANT_Methodref_info] for above | |
| 245 | + // * [UTF-8] "java/lang/Integer" | |
| 246 | + // * [CONSTANT_Class_info] for above | |
| 247 | + // * [UTF-8] "(I)V" | |
| 248 | + // * [CONSTANT_NameAndType_info] for above | |
| 249 | + // * [CONSTANT_Methodref_info] for above | |
| 250 | + // * [UTF-8] "intValue" | |
| 251 | + // * [UTF-8] "()I" | |
| 252 | + // * [CONSTANT_NameAndType_info] for above | |
| 253 | + // * [CONSTANT_Methodref_info] for above | |
| 254 | + // * [UTF-8] "java/lang/Long" | |
| 255 | + // * [CONSTANT_Class_info] for above | |
| 256 | + // * [UTF-8] "(J)V" | |
| 257 | + // * [CONSTANT_NameAndType_info] for above | |
| 258 | + // * [CONSTANT_Methodref_info] for above | |
| 259 | + // * [UTF-8] "longValue" | |
| 260 | + // * [UTF-8] "()J" | |
| 261 | + // * [CONSTANT_NameAndType_info] for above | |
| 262 | + // * [CONSTANT_Methodref_info] for above | |
| 263 | + // * [UTF-8] "java/lang/Short" | |
| 264 | + // * [CONSTANT_Class_info] for above | |
| 265 | + // * [UTF-8] "(S)V" | |
| 266 | + // * [CONSTANT_NameAndType_info] for above | |
| 267 | + // * [CONSTANT_Methodref_info] for above | |
| 268 | + // * [UTF-8] "shortValue" | |
| 269 | + // * [UTF-8] "()S" | |
| 270 | + // * [CONSTANT_NameAndType_info] for above | |
| 271 | + // * [CONSTANT_Methodref_info] for above | |
| 272 | + | |
| 273 | + short numCPEntries = NUM_BASE_CPOOL_ENTRIES + NUM_COMMON_CPOOL_ENTRIES; | |
| 274 | + boolean usesPrimitives = usesPrimitiveTypes(); | |
| 275 | + if (usesPrimitives) { | |
| 276 | + numCPEntries += NUM_BOXING_CPOOL_ENTRIES; | |
| 277 | + } | |
| 278 | + if (forSerialization) { | |
| 279 | + numCPEntries += NUM_SERIALIZATION_CPOOL_ENTRIES; | |
| 280 | + } | |
| 281 | + | |
| 282 | + // Add in variable-length number of entries to be able to describe | |
| 283 | + // non-primitive parameter types and checked exceptions. | |
| 284 | + numCPEntries += (short) (2 * numNonPrimitiveParameterTypes()); | |
| 285 | + | |
| 286 | + asm.emitShort(add(numCPEntries, S1)); | |
| 287 | + | |
| 288 | + final String generatedName = generateName(isConstructor, forSerialization); | |
| 289 | + asm.emitConstantPoolUTF8(generatedName); | |
| 290 | + asm.emitConstantPoolClass(asm.cpi()); | |
| 291 | + thisClass = asm.cpi(); | |
| 292 | + if (isConstructor) { | |
| 293 | + if (forSerialization) { | |
| 294 | + asm.emitConstantPoolUTF8 | |
| 295 | + ("sun/reflect/SerializationConstructorAccessorImpl"); | |
| 296 | + } else { | |
| 297 | + asm.emitConstantPoolUTF8("sun/reflect/ConstructorAccessorImpl"); | |
| 298 | + } | |
| 299 | + } else { | |
| 300 | + asm.emitConstantPoolUTF8("sun/reflect/MethodAccessorImpl"); | |
| 301 | + } | |
| 302 | + asm.emitConstantPoolClass(asm.cpi()); | |
| 303 | + superClass = asm.cpi(); | |
| 304 | + asm.emitConstantPoolUTF8(getClassName(declaringClass, false)); | |
| 305 | + asm.emitConstantPoolClass(asm.cpi()); | |
| 306 | + targetClass = asm.cpi(); | |
| 307 | + short serializationTargetClassIdx = (short) 0; | |
| 308 | + if (forSerialization) { | |
| 309 | + asm.emitConstantPoolUTF8(getClassName(serializationTargetClass, false)); | |
| 310 | + asm.emitConstantPoolClass(asm.cpi()); | |
| 311 | + serializationTargetClassIdx = asm.cpi(); | |
| 312 | + } | |
| 313 | + asm.emitConstantPoolUTF8(name); | |
| 314 | + asm.emitConstantPoolUTF8(buildInternalSignature()); | |
| 315 | + asm.emitConstantPoolNameAndType(sub(asm.cpi(), S1), asm.cpi()); | |
| 316 | + if (isInterface()) { | |
| 317 | + asm.emitConstantPoolInterfaceMethodref(targetClass, asm.cpi()); | |
| 318 | + } else { | |
| 319 | + if (forSerialization) { | |
| 320 | + asm.emitConstantPoolMethodref(serializationTargetClassIdx, asm.cpi()); | |
| 321 | + } else { | |
| 322 | + asm.emitConstantPoolMethodref(targetClass, asm.cpi()); | |
| 323 | + } | |
| 324 | + } | |
| 325 | + targetMethodRef = asm.cpi(); | |
| 326 | + if (isConstructor) { | |
| 327 | + asm.emitConstantPoolUTF8("newInstance"); | |
| 328 | + } else { | |
| 329 | + asm.emitConstantPoolUTF8("invoke"); | |
| 330 | + } | |
| 331 | + invokeIdx = asm.cpi(); | |
| 332 | + if (isConstructor) { | |
| 333 | + asm.emitConstantPoolUTF8("([Ljava/lang/Object;)Ljava/lang/Object;"); | |
| 334 | + } else { | |
| 335 | + asm.emitConstantPoolUTF8 | |
| 336 | + ("(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;"); | |
| 337 | + } | |
| 338 | + invokeDescriptorIdx = asm.cpi(); | |
| 339 | + | |
| 340 | + // Output class information for non-primitive parameter types | |
| 341 | + nonPrimitiveParametersBaseIdx = add(asm.cpi(), S2); | |
| 342 | + for (int i = 0; i < parameterTypes.length; i++) { | |
| 343 | + Class c = parameterTypes[i]; | |
| 344 | + if (!isPrimitive(c)) { | |
| 345 | + asm.emitConstantPoolUTF8(getClassName(c, false)); | |
| 346 | + asm.emitConstantPoolClass(asm.cpi()); | |
| 347 | + } | |
| 348 | + } | |
| 349 | + | |
| 350 | + // Entries common to FieldAccessor, MethodAccessor and ConstructorAccessor | |
| 351 | + emitCommonConstantPoolEntries(); | |
| 352 | + | |
| 353 | + // Boxing entries | |
| 354 | + if (usesPrimitives) { | |
| 355 | + emitBoxingContantPoolEntries(); | |
| 356 | + } | |
| 357 | + | |
| 358 | + if (asm.cpi() != numCPEntries) { | |
| 359 | + throw new InternalError("Adjust this code (cpi = " + asm.cpi() + | |
| 360 | + ", numCPEntries = " + numCPEntries + ")"); | |
| 361 | + } | |
| 362 | + | |
| 363 | + // Access flags | |
| 364 | + asm.emitShort(ACC_PUBLIC); | |
| 365 | + | |
| 366 | + // This class | |
| 367 | + asm.emitShort(thisClass); | |
| 368 | + | |
| 369 | + // Superclass | |
| 370 | + asm.emitShort(superClass); | |
| 371 | + | |
| 372 | + // Interfaces count and interfaces | |
| 373 | + asm.emitShort(S0); | |
| 374 | + | |
| 375 | + // Fields count and fields | |
| 376 | + asm.emitShort(S0); | |
| 377 | + | |
| 378 | + // Methods count and methods | |
| 379 | + asm.emitShort(NUM_METHODS); | |
| 380 | + | |
| 381 | + emitConstructor(); | |
| 382 | + emitInvoke(); | |
| 383 | + | |
| 384 | + // Additional attributes (none) | |
| 385 | + asm.emitShort(S0); | |
| 386 | + | |
| 387 | + // Load class | |
| 388 | + vec.trim(); | |
| 389 | + final byte[] bytes = vec.getData(); | |
| 390 | + // Note: the class loader is the only thing that really matters | |
| 391 | + // here -- it's important to get the generated code into the | |
| 392 | + // same namespace as the target class. Since the generated code | |
| 393 | + // is privileged anyway, the protection domain probably doesn't | |
| 394 | + // matter. | |
| 395 | + return AccessController.doPrivileged( | |
| 396 | + new PrivilegedAction<MagicAccessorImpl>() { | |
| 397 | + public MagicAccessorImpl run() { | |
| 398 | + try { | |
| 399 | + return (MagicAccessorImpl) | |
| 400 | + ClassDefiner.defineClass | |
| 401 | + (generatedName, | |
| 402 | + bytes, | |
| 403 | + 0, | |
| 404 | + bytes.length, | |
| 405 | + declaringClass.getClassLoader()).newInstance(); | |
| 406 | + } catch (InstantiationException e) { | |
| 407 | + throw (InternalError) | |
| 408 | + new InternalError().initCause(e); | |
| 409 | + } catch (IllegalAccessException e) { | |
| 410 | + throw (InternalError) | |
| 411 | + new InternalError().initCause(e); | |
| 412 | + } | |
| 413 | + } | |
| 414 | + }); | |
| 415 | + } | |
| 416 | + | |
| 417 | + /** This emits the code for either invoke() or newInstance() */ | |
| 418 | + private void emitInvoke() { | |
| 419 | + // NOTE that this code will only handle 65535 parameters since we | |
| 420 | + // use the sipush instruction to get the array index on the | |
| 421 | + // operand stack. | |
| 422 | + if (parameterTypes.length > 65535) { | |
| 423 | + throw new InternalError("Can't handle more than 65535 parameters"); | |
| 424 | + } | |
| 425 | + | |
| 426 | + // Generate code into fresh code buffer | |
| 427 | + ClassFileAssembler cb = new ClassFileAssembler(); | |
| 428 | + if (isConstructor) { | |
| 429 | + // 1 incoming argument | |
| 430 | + cb.setMaxLocals(2); | |
| 431 | + } else { | |
| 432 | + // 2 incoming arguments | |
| 433 | + cb.setMaxLocals(3); | |
| 434 | + } | |
| 435 | + | |
| 436 | + short illegalArgStartPC = 0; | |
| 437 | + | |
| 438 | + if (isConstructor) { | |
| 439 | + // Instantiate target class before continuing | |
| 440 | + // new <target class type> | |
| 441 | + // dup | |
| 442 | + cb.opc_new(targetClass); | |
| 443 | + cb.opc_dup(); | |
| 444 | + } else { | |
| 445 | + // Setup before iterating down argument list | |
| 446 | + if (isPrimitive(returnType)) { | |
| 447 | + // new <boxing type for primitive type> | |
| 448 | + // dup | |
| 449 | + // ... (see below:) | |
| 450 | + // invokespecial <constructor for boxing type for primitive type> | |
| 451 | + // areturn | |
| 452 | + cb.opc_new(indexForPrimitiveType(returnType)); | |
| 453 | + cb.opc_dup(); | |
| 454 | + } | |
| 455 | + | |
| 456 | + // Get target object on operand stack if necessary. | |
| 457 | + | |
| 458 | + // We need to do an explicit null check here; we won't see | |
| 459 | + // NullPointerExceptions from the invoke bytecode, since it's | |
| 460 | + // covered by an exception handler. | |
| 461 | + if (!isStatic()) { | |
| 462 | + // aload_1 | |
| 463 | + // ifnonnull <checkcast label> | |
| 464 | + // new <NullPointerException> | |
| 465 | + // dup | |
| 466 | + // invokespecial <NullPointerException ctor> | |
| 467 | + // athrow | |
| 468 | + // <checkcast label:> | |
| 469 | + // aload_1 | |
| 470 | + // checkcast <target class's type> | |
| 471 | + cb.opc_aload_1(); | |
| 472 | + Label l = new Label(); | |
| 473 | + cb.opc_ifnonnull(l); | |
| 474 | + cb.opc_new(nullPointerClass); | |
| 475 | + cb.opc_dup(); | |
| 476 | + cb.opc_invokespecial(nullPointerCtorIdx, 0, 0); | |
| 477 | + cb.opc_athrow(); | |
| 478 | + l.bind(); | |
| 479 | + illegalArgStartPC = cb.getLength(); | |
| 480 | + cb.opc_aload_1(); | |
| 481 | + cb.opc_checkcast(targetClass); | |
| 482 | + } | |
| 483 | + } | |
| 484 | + | |
| 485 | + // Have to check length of incoming array and throw | |
| 486 | + // IllegalArgumentException if not correct. A concession to the | |
| 487 | + // JCK (isn't clearly specified in the spec): we allow null in the | |
| 488 | + // case where the argument list is zero length. | |
| 489 | + // if no-arg: | |
| 490 | + // aload_2 | aload_1 (Method | Constructor) | |
| 491 | + // ifnull <success label> | |
| 492 | + // aload_2 | aload_1 | |
| 493 | + // arraylength | |
| 494 | + // sipush <num parameter types> | |
| 495 | + // if_icmpeq <success label> | |
| 496 | + // new <IllegalArgumentException> | |
| 497 | + // dup | |
| 498 | + // invokespecial <IllegalArgumentException ctor> | |
| 499 | + // athrow | |
| 500 | + // <success label:> | |
| 501 | + Label successLabel = new Label(); | |
| 502 | + if (parameterTypes.length == 0) { | |
| 503 | + if (isConstructor) { | |
| 504 | + cb.opc_aload_1(); | |
| 505 | + } else { | |
| 506 | + cb.opc_aload_2(); | |
| 507 | + } | |
| 508 | + cb.opc_ifnull(successLabel); | |
| 509 | + } | |
| 510 | + if (isConstructor) { | |
| 511 | + cb.opc_aload_1(); | |
| 512 | + } else { | |
| 513 | + cb.opc_aload_2(); | |
| 514 | + } | |
| 515 | + cb.opc_arraylength(); | |
| 516 | + cb.opc_sipush((short) parameterTypes.length); | |
| 517 | + cb.opc_if_icmpeq(successLabel); | |
| 518 | + cb.opc_new(illegalArgumentClass); | |
| 519 | + cb.opc_dup(); | |
| 520 | + cb.opc_invokespecial(illegalArgumentCtorIdx, 0, 0); | |
| 521 | + cb.opc_athrow(); | |
| 522 | + successLabel.bind(); | |
| 523 | + | |
| 524 | + // Iterate through incoming actual parameters, ensuring that each | |
| 525 | + // is compatible with the formal parameter type, and pushing the | |
| 526 | + // actual on the operand stack (unboxing and widening if necessary). | |
| 527 | + | |
| 528 | + short paramTypeCPIdx = nonPrimitiveParametersBaseIdx; | |
| 529 | + Label nextParamLabel = null; | |
| 530 | + byte count = 1; // both invokeinterface opcode's "count" as well as | |
| 531 | + // num args of other invoke bytecodes | |
| 532 | + for (int i = 0; i < parameterTypes.length; i++) { | |
| 533 | + Class paramType = parameterTypes[i]; | |
| 534 | + count += (byte) typeSizeInStackSlots(paramType); | |
| 535 | + if (nextParamLabel != null) { | |
| 536 | + nextParamLabel.bind(); | |
| 537 | + nextParamLabel = null; | |
| 538 | + } | |
| 539 | + // aload_2 | aload_1 | |
| 540 | + // sipush <index> | |
| 541 | + // aaload | |
| 542 | + if (isConstructor) { | |
| 543 | + cb.opc_aload_1(); | |
| 544 | + } else { | |
| 545 | + cb.opc_aload_2(); | |
| 546 | + } | |
| 547 | + cb.opc_sipush((short) i); | |
| 548 | + cb.opc_aaload(); | |
| 549 | + if (isPrimitive(paramType)) { | |
| 550 | + // Unboxing code. | |
| 551 | + // Put parameter into temporary local variable | |
| 552 | + // astore_3 | astore_2 | |
| 553 | + if (isConstructor) { | |
| 554 | + cb.opc_astore_2(); | |
| 555 | + } else { | |
| 556 | + cb.opc_astore_3(); | |
| 557 | + } | |
| 558 | + | |
| 559 | + // repeat for all possible widening conversions: | |
| 560 | + // aload_3 | aload_2 | |
| 561 | + // instanceof <primitive boxing type> | |
| 562 | + // ifeq <next unboxing label> | |
| 563 | + // aload_3 | aload_2 | |
| 564 | + // checkcast <primitive boxing type> // Note: this is "redundant", | |
| 565 | + // // but necessary for the verifier | |
| 566 | + // invokevirtual <unboxing method> | |
| 567 | + // <widening conversion bytecode, if necessary> | |
| 568 | + // goto <next parameter label> | |
| 569 | + // <next unboxing label:> ... | |
| 570 | + // last unboxing label: | |
| 571 | + // new <IllegalArgumentException> | |
| 572 | + // dup | |
| 573 | + // invokespecial <IllegalArgumentException ctor> | |
| 574 | + // athrow | |
| 575 | + | |
| 576 | + Label l = null; // unboxing label | |
| 577 | + nextParamLabel = new Label(); | |
| 578 | + | |
| 579 | + for (int j = 0; j < primitiveTypes.length; j++) { | |
| 580 | + Class c = primitiveTypes[j]; | |
| 581 | + if (canWidenTo(c, paramType)) { | |
| 582 | + if (l != null) { | |
| 583 | + l.bind(); | |
| 584 | + } | |
| 585 | + // Emit checking and unboxing code for this type | |
| 586 | + if (isConstructor) { | |
| 587 | + cb.opc_aload_2(); | |
| 588 | + } else { | |
| 589 | + cb.opc_aload_3(); | |
| 590 | + } | |
| 591 | + cb.opc_instanceof(indexForPrimitiveType(c)); | |
| 592 | + l = new Label(); | |
| 593 | + cb.opc_ifeq(l); | |
| 594 | + if (isConstructor) { | |
| 595 | + cb.opc_aload_2(); | |
| 596 | + } else { | |
| 597 | + cb.opc_aload_3(); | |
| 598 | + } | |
| 599 | + cb.opc_checkcast(indexForPrimitiveType(c)); | |
| 600 | + cb.opc_invokevirtual(unboxingMethodForPrimitiveType(c), | |
| 601 | + 0, | |
| 602 | + typeSizeInStackSlots(c)); | |
| 603 | + emitWideningBytecodeForPrimitiveConversion(cb, | |
| 604 | + c, | |
| 605 | + paramType); | |
| 606 | + cb.opc_goto(nextParamLabel); | |
| 607 | + } | |
| 608 | + } | |
| 609 | + | |
| 610 | + if (l == null) { | |
| 611 | + throw new InternalError | |
| 612 | + ("Must have found at least identity conversion"); | |
| 613 | + } | |
| 614 | + | |
| 615 | + // Fell through; given object is null or invalid. According to | |
| 616 | + // the spec, we can throw IllegalArgumentException for both of | |
| 617 | + // these cases. | |
| 618 | + | |
| 619 | + l.bind(); | |
| 620 | + cb.opc_new(illegalArgumentClass); | |
| 621 | + cb.opc_dup(); | |
| 622 | + cb.opc_invokespecial(illegalArgumentCtorIdx, 0, 0); | |
| 623 | + cb.opc_athrow(); | |
| 624 | + } else { | |
| 625 | + // Emit appropriate checkcast | |
| 626 | + cb.opc_checkcast(paramTypeCPIdx); | |
| 627 | + paramTypeCPIdx = add(paramTypeCPIdx, S2); | |
| 628 | + // Fall through to next argument | |
| 629 | + } | |
| 630 | + } | |
| 631 | + // Bind last goto if present | |
| 632 | + if (nextParamLabel != null) { | |
| 633 | + nextParamLabel.bind(); | |
| 634 | + } | |
| 635 | + | |
| 636 | + short invokeStartPC = cb.getLength(); | |
| 637 | + | |
| 638 | + // OK, ready to perform the invocation. | |
| 639 | + if (isConstructor) { | |
| 640 | + cb.opc_invokespecial(targetMethodRef, count, 0); | |
| 641 | + } else { | |
| 642 | + if (isStatic()) { | |
| 643 | + cb.opc_invokestatic(targetMethodRef, | |
| 644 | + count, | |
| 645 | + typeSizeInStackSlots(returnType)); | |
| 646 | + } else { | |
| 647 | + if (isInterface()) { | |
| 648 | + cb.opc_invokeinterface(targetMethodRef, | |
| 649 | + count, | |
| 650 | + count, | |
| 651 | + typeSizeInStackSlots(returnType)); | |
| 652 | + } else { | |
| 653 | + cb.opc_invokevirtual(targetMethodRef, | |
| 654 | + count, | |
| 655 | + typeSizeInStackSlots(returnType)); | |
| 656 | + } | |
| 657 | + } | |
| 658 | + } | |
| 659 | + | |
| 660 | + short invokeEndPC = cb.getLength(); | |
| 661 | + | |
| 662 | + if (!isConstructor) { | |
| 663 | + // Box return value if necessary | |
| 664 | + if (isPrimitive(returnType)) { | |
| 665 | + cb.opc_invokespecial(ctorIndexForPrimitiveType(returnType), | |
| 666 | + typeSizeInStackSlots(returnType), | |
| 667 | + 0); | |
| 668 | + } else if (returnType == Void.TYPE) { | |
| 669 | + cb.opc_aconst_null(); | |
| 670 | + } | |
| 671 | + } | |
| 672 | + cb.opc_areturn(); | |
| 673 | + | |
| 674 | + // We generate two exception handlers; one which is responsible | |
| 675 | + // for catching ClassCastException and NullPointerException and | |
| 676 | + // throwing IllegalArgumentException, and the other which catches | |
| 677 | + // all java/lang/Throwable objects thrown from the target method | |
| 678 | + // and wraps them in InvocationTargetExceptions. | |
| 679 | + | |
| 680 | + short classCastHandler = cb.getLength(); | |
| 681 | + | |
| 682 | + // ClassCast, etc. exception handler | |
| 683 | + cb.setStack(1); | |
| 684 | + cb.opc_invokespecial(toStringIdx, 0, 1); | |
| 685 | + cb.opc_new(illegalArgumentClass); | |
| 686 | + cb.opc_dup_x1(); | |
| 687 | + cb.opc_swap(); | |
| 688 | + cb.opc_invokespecial(illegalArgumentStringCtorIdx, 1, 0); | |
| 689 | + cb.opc_athrow(); | |
| 690 | + | |
| 691 | + short invocationTargetHandler = cb.getLength(); | |
| 692 | + | |
| 693 | + // InvocationTargetException exception handler | |
| 694 | + cb.setStack(1); | |
| 695 | + cb.opc_new(invocationTargetClass); | |
| 696 | + cb.opc_dup_x1(); | |
| 697 | + cb.opc_swap(); | |
| 698 | + cb.opc_invokespecial(invocationTargetCtorIdx, 1, 0); | |
| 699 | + cb.opc_athrow(); | |
| 700 | + | |
| 701 | + // Generate exception table. We cover the entire code sequence | |
| 702 | + // with an exception handler which catches ClassCastException and | |
| 703 | + // converts it into an IllegalArgumentException. | |
| 704 | + | |
| 705 | + ClassFileAssembler exc = new ClassFileAssembler(); | |
| 706 | + | |
| 707 | + exc.emitShort(illegalArgStartPC); // start PC | |
| 708 | + exc.emitShort(invokeStartPC); // end PC | |
| 709 | + exc.emitShort(classCastHandler); // handler PC | |
| 710 | + exc.emitShort(classCastClass); // catch type | |
| 711 | + | |
| 712 | + exc.emitShort(illegalArgStartPC); // start PC | |
| 713 | + exc.emitShort(invokeStartPC); // end PC | |
| 714 | + exc.emitShort(classCastHandler); // handler PC | |
| 715 | + exc.emitShort(nullPointerClass); // catch type | |
| 716 | + | |
| 717 | + exc.emitShort(invokeStartPC); // start PC | |
| 718 | + exc.emitShort(invokeEndPC); // end PC | |
| 719 | + exc.emitShort(invocationTargetHandler); // handler PC | |
| 720 | + exc.emitShort(throwableClass); // catch type | |
| 721 | + | |
| 722 | + emitMethod(invokeIdx, cb.getMaxLocals(), cb, exc, | |
| 723 | + new short[] { invocationTargetClass }); | |
| 724 | + } | |
| 725 | + | |
| 726 | + private boolean usesPrimitiveTypes() { | |
| 727 | + // We need to emit boxing/unboxing constant pool information if | |
| 728 | + // the method takes a primitive type for any of its parameters or | |
| 729 | + // returns a primitive value (except void) | |
| 730 | + if (returnType.isPrimitive()) { | |
| 731 | + return true; | |
| 732 | + } | |
| 733 | + for (int i = 0; i < parameterTypes.length; i++) { | |
| 734 | + if (parameterTypes[i].isPrimitive()) { | |
| 735 | + return true; | |
| 736 | + } | |
| 737 | + } | |
| 738 | + return false; | |
| 739 | + } | |
| 740 | + | |
| 741 | + private int numNonPrimitiveParameterTypes() { | |
| 742 | + int num = 0; | |
| 743 | + for (int i = 0; i < parameterTypes.length; i++) { | |
| 744 | + if (!parameterTypes[i].isPrimitive()) { | |
| 745 | + ++num; | |
| 746 | + } | |
| 747 | + } | |
| 748 | + return num; | |
| 749 | + } | |
| 750 | + | |
| 751 | + private boolean isInterface() { | |
| 752 | + return declaringClass.isInterface(); | |
| 753 | + } | |
| 754 | + | |
| 755 | + private String buildInternalSignature() { | |
| 756 | + StringBuffer buf = new StringBuffer(); | |
| 757 | + buf.append("("); | |
| 758 | + for (int i = 0; i < parameterTypes.length; i++) { | |
| 759 | + buf.append(getClassName(parameterTypes[i], true)); | |
| 760 | + } | |
| 761 | + buf.append(")"); | |
| 762 | + buf.append(getClassName(returnType, true)); | |
| 763 | + return buf.toString(); | |
| 764 | + } | |
| 765 | + | |
| 766 | + private static synchronized String generateName(boolean isConstructor, | |
| 767 | + boolean forSerialization) | |
| 768 | + { | |
| 769 | + if (isConstructor) { | |
| 770 | + if (forSerialization) { | |
| 771 | + int num = ++serializationConstructorSymnum; | |
| 772 | + return "sun/reflect/GeneratedSerializationConstructorAccessor" + num; | |
| 773 | + } else { | |
| 774 | + int num = ++constructorSymnum; | |
| 775 | + return "sun/reflect/GeneratedConstructorAccessor" + num; | |
| 776 | + } | |
| 777 | + } else { | |
| 778 | + int num = ++methodSymnum; | |
| 779 | + return "sun/reflect/GeneratedMethodAccessor" + num; | |
| 780 | + } | |
| 781 | + } | |
| 782 | +} | |