1 /* 2 * Copyright (c) 2012, 2013, 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 java.lang.invoke; 27 28 import jdk.internal.org.objectweb.asm.*; 29 import sun.invoke.util.BytecodeDescriptor; 30 import jdk.internal.misc.Unsafe; 31 import sun.security.action.GetPropertyAction; 32 import sun.security.action.GetBooleanAction; 33 34 import java.io.FilePermission; 35 import java.io.Serializable; 36 import java.lang.reflect.Constructor; 37 import java.security.AccessController; 38 import java.security.PrivilegedAction; 39 import java.util.LinkedHashSet; 40 import java.util.concurrent.atomic.AtomicInteger; 41 import java.util.PropertyPermission; 42 import java.util.Set; 43 44 import static jdk.internal.org.objectweb.asm.Opcodes.*; 45 46 /** 47 * Lambda metafactory implementation which dynamically creates an 48 * inner-class-like class per lambda callsite. 49 * 50 * @see LambdaMetafactory 51 */ 52 /* package */ final class InnerClassLambdaMetafactory extends AbstractValidatingLambdaMetafactory { 53 private static final Unsafe UNSAFE = Unsafe.getUnsafe(); 54 55 private static final int CLASSFILE_VERSION = 52; 56 private static final String METHOD_DESCRIPTOR_VOID = Type.getMethodDescriptor(Type.VOID_TYPE); 57 private static final String JAVA_LANG_OBJECT = "java/lang/Object"; 58 private static final String NAME_CTOR = "<init>"; 59 private static final String NAME_FACTORY = "get$Lambda"; 60 61 //Serialization support 62 private static final String NAME_SERIALIZED_LAMBDA = "java/lang/invoke/SerializedLambda"; 63 private static final String NAME_NOT_SERIALIZABLE_EXCEPTION = "java/io/NotSerializableException"; 64 private static final String DESCR_METHOD_WRITE_REPLACE = "()Ljava/lang/Object;"; 65 private static final String DESCR_METHOD_WRITE_OBJECT = "(Ljava/io/ObjectOutputStream;)V"; 66 private static final String DESCR_METHOD_READ_OBJECT = "(Ljava/io/ObjectInputStream;)V"; 67 private static final String NAME_METHOD_WRITE_REPLACE = "writeReplace"; 68 private static final String NAME_METHOD_READ_OBJECT = "readObject"; 69 private static final String NAME_METHOD_WRITE_OBJECT = "writeObject"; 70 71 private static final String DESCR_CLASS = "Ljava/lang/Class;"; 72 private static final String DESCR_STRING = "Ljava/lang/String;"; 73 private static final String DESCR_OBJECT = "Ljava/lang/Object;"; 74 private static final String DESCR_CTOR_SERIALIZED_LAMBDA 75 = "(" + DESCR_CLASS + DESCR_STRING + DESCR_STRING + DESCR_STRING + "I" 76 + DESCR_STRING + DESCR_STRING + DESCR_STRING + DESCR_STRING + "[" + DESCR_OBJECT + ")V"; 77 78 private static final String DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION = "(Ljava/lang/String;)V"; 79 private static final String[] SER_HOSTILE_EXCEPTIONS = new String[] {NAME_NOT_SERIALIZABLE_EXCEPTION}; 80 81 private static final String DESCR_HIDDEN = "Ljdk/internal/vm/annotation/Hidden;"; 82 83 private static final String[] EMPTY_STRING_ARRAY = new String[0]; 84 85 // Used to ensure that each spun class name is unique 86 private static final AtomicInteger counter = new AtomicInteger(0); 87 88 // For dumping generated classes to disk, for debugging purposes 89 private static final ProxyClassesDumper dumper; 90 91 private static final boolean disableEagerInitialization; 92 93 static { 94 final String dumpProxyClassesKey = "jdk.internal.lambda.dumpProxyClasses"; 95 String dumpPath = GetPropertyAction.privilegedGetProperty(dumpProxyClassesKey); 96 dumper = (null == dumpPath) ? null : ProxyClassesDumper.getInstance(dumpPath); 97 98 final String disableEagerInitializationKey = "jdk.internal.lambda.disableEagerInitialization"; 99 disableEagerInitialization = GetBooleanAction.privilegedGetProperty(disableEagerInitializationKey); 100 } 101 102 // See context values in AbstractValidatingLambdaMetafactory 103 private final String implMethodClassName; // Name of type containing implementation "CC" 104 private final String implMethodName; // Name of implementation method "impl" 105 private final String implMethodDesc; // Type descriptor for implementation methods "(I)Ljava/lang/String;" 106 private final MethodType constructorType; // Generated class constructor type "(CC)void" 107 private final ClassWriter cw; // ASM class writer 108 private final String[] argNames; // Generated names for the constructor arguments 109 private final String[] argDescs; // Type descriptors for the constructor arguments 110 private final String lambdaClassName; // Generated name for the generated class "X$$Lambda$1" 111 112 /** 113 * General meta-factory constructor, supporting both standard cases and 114 * allowing for uncommon options such as serialization or bridging. 115 * 116 * @param caller Stacked automatically by VM; represents a lookup context 117 * with the accessibility privileges of the caller. 118 * @param invokedType Stacked automatically by VM; the signature of the 119 * invoked method, which includes the expected static 120 * type of the returned lambda object, and the static 121 * types of the captured arguments for the lambda. In 122 * the event that the implementation method is an 123 * instance method, the first argument in the invocation 124 * signature will correspond to the receiver. 125 * @param samMethodName Name of the method in the functional interface to 126 * which the lambda or method reference is being 127 * converted, represented as a String. 128 * @param samMethodType Type of the method in the functional interface to 129 * which the lambda or method reference is being 130 * converted, represented as a MethodType. 131 * @param implMethod The implementation method which should be called (with 132 * suitable adaptation of argument types, return types, 133 * and adjustment for captured arguments) when methods of 134 * the resulting functional interface instance are invoked. 135 * @param instantiatedMethodType The signature of the primary functional 136 * interface method after type variables are 137 * substituted with their instantiation from 138 * the capture site 139 * @param isSerializable Should the lambda be made serializable? If set, 140 * either the target type or one of the additional SAM 141 * types must extend {@code Serializable}. 142 * @param markerInterfaces Additional interfaces which the lambda object 143 * should implement. 144 * @param additionalBridges Method types for additional signatures to be 145 * bridged to the implementation method 146 * @throws LambdaConversionException If any of the meta-factory protocol 147 * invariants are violated 148 */ InnerClassLambdaMetafactory(MethodHandles.Lookup caller, MethodType invokedType, String samMethodName, MethodType samMethodType, MethodHandle implMethod, MethodType instantiatedMethodType, boolean isSerializable, Class<?>[] markerInterfaces, MethodType[] additionalBridges)149 public InnerClassLambdaMetafactory(MethodHandles.Lookup caller, 150 MethodType invokedType, 151 String samMethodName, 152 MethodType samMethodType, 153 MethodHandle implMethod, 154 MethodType instantiatedMethodType, 155 boolean isSerializable, 156 Class<?>[] markerInterfaces, 157 MethodType[] additionalBridges) 158 throws LambdaConversionException { 159 super(caller, invokedType, samMethodName, samMethodType, 160 implMethod, instantiatedMethodType, 161 isSerializable, markerInterfaces, additionalBridges); 162 implMethodClassName = implClass.getName().replace('.', '/'); 163 implMethodName = implInfo.getName(); 164 implMethodDesc = implInfo.getMethodType().toMethodDescriptorString(); 165 constructorType = invokedType.changeReturnType(Void.TYPE); 166 lambdaClassName = targetClass.getName().replace('.', '/') + "$$Lambda$" + counter.incrementAndGet(); 167 cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); 168 int parameterCount = invokedType.parameterCount(); 169 if (parameterCount > 0) { 170 argNames = new String[parameterCount]; 171 argDescs = new String[parameterCount]; 172 for (int i = 0; i < parameterCount; i++) { 173 argNames[i] = "arg$" + (i + 1); 174 argDescs[i] = BytecodeDescriptor.unparse(invokedType.parameterType(i)); 175 } 176 } else { 177 argNames = argDescs = EMPTY_STRING_ARRAY; 178 } 179 } 180 181 /** 182 * Build the CallSite. Generate a class file which implements the functional 183 * interface, define the class, if there are no parameters create an instance 184 * of the class which the CallSite will return, otherwise, generate handles 185 * which will call the class' constructor. 186 * 187 * @return a CallSite, which, when invoked, will return an instance of the 188 * functional interface 189 * @throws ReflectiveOperationException 190 * @throws LambdaConversionException If properly formed functional interface 191 * is not found 192 */ 193 @Override buildCallSite()194 CallSite buildCallSite() throws LambdaConversionException { 195 final Class<?> innerClass = spinInnerClass(); 196 if (invokedType.parameterCount() == 0 && !disableEagerInitialization) { 197 // In the case of a non-capturing lambda, we optimize linkage by pre-computing a single instance, 198 // unless we've suppressed eager initialization 199 final Constructor<?>[] ctrs = AccessController.doPrivileged( 200 new PrivilegedAction<>() { 201 @Override 202 public Constructor<?>[] run() { 203 Constructor<?>[] ctrs = innerClass.getDeclaredConstructors(); 204 if (ctrs.length == 1) { 205 // The lambda implementing inner class constructor is private, set 206 // it accessible (by us) before creating the constant sole instance 207 ctrs[0].setAccessible(true); 208 } 209 return ctrs; 210 } 211 }); 212 if (ctrs.length != 1) { 213 throw new LambdaConversionException("Expected one lambda constructor for " 214 + innerClass.getCanonicalName() + ", got " + ctrs.length); 215 } 216 217 try { 218 Object inst = ctrs[0].newInstance(); 219 return new ConstantCallSite(MethodHandles.constant(samBase, inst)); 220 } 221 catch (ReflectiveOperationException e) { 222 throw new LambdaConversionException("Exception instantiating lambda object", e); 223 } 224 } else { 225 try { 226 if (!disableEagerInitialization) { 227 UNSAFE.ensureClassInitialized(innerClass); 228 } 229 return new ConstantCallSite( 230 MethodHandles.Lookup.IMPL_LOOKUP 231 .findStatic(innerClass, NAME_FACTORY, invokedType)); 232 } 233 catch (ReflectiveOperationException e) { 234 throw new LambdaConversionException("Exception finding constructor", e); 235 } 236 } 237 } 238 239 /** 240 * Generate a class file which implements the functional 241 * interface, define and return the class. 242 * 243 * @implNote The class that is generated does not include signature 244 * information for exceptions that may be present on the SAM method. 245 * This is to reduce classfile size, and is harmless as checked exceptions 246 * are erased anyway, no one will ever compile against this classfile, 247 * and we make no guarantees about the reflective properties of lambda 248 * objects. 249 * 250 * @return a Class which implements the functional interface 251 * @throws LambdaConversionException If properly formed functional interface 252 * is not found 253 */ spinInnerClass()254 private Class<?> spinInnerClass() throws LambdaConversionException { 255 String[] interfaces; 256 String samIntf = samBase.getName().replace('.', '/'); 257 boolean accidentallySerializable = !isSerializable && Serializable.class.isAssignableFrom(samBase); 258 if (markerInterfaces.length == 0) { 259 interfaces = new String[]{samIntf}; 260 } else { 261 // Assure no duplicate interfaces (ClassFormatError) 262 Set<String> itfs = new LinkedHashSet<>(markerInterfaces.length + 1); 263 itfs.add(samIntf); 264 for (Class<?> markerInterface : markerInterfaces) { 265 itfs.add(markerInterface.getName().replace('.', '/')); 266 accidentallySerializable |= !isSerializable && Serializable.class.isAssignableFrom(markerInterface); 267 } 268 interfaces = itfs.toArray(new String[itfs.size()]); 269 } 270 271 cw.visit(CLASSFILE_VERSION, ACC_SUPER + ACC_FINAL + ACC_SYNTHETIC, 272 lambdaClassName, null, 273 JAVA_LANG_OBJECT, interfaces); 274 275 // Generate final fields to be filled in by constructor 276 for (int i = 0; i < argDescs.length; i++) { 277 FieldVisitor fv = cw.visitField(ACC_PRIVATE + ACC_FINAL, 278 argNames[i], 279 argDescs[i], 280 null, null); 281 fv.visitEnd(); 282 } 283 284 generateConstructor(); 285 286 if (invokedType.parameterCount() != 0 || disableEagerInitialization) { 287 generateFactory(); 288 } 289 290 // Forward the SAM method 291 MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, samMethodName, 292 samMethodType.toMethodDescriptorString(), null, null); 293 mv.visitAnnotation(DESCR_HIDDEN, true); 294 new ForwardingMethodGenerator(mv).generate(samMethodType); 295 296 // Forward the bridges 297 if (additionalBridges != null) { 298 for (MethodType mt : additionalBridges) { 299 mv = cw.visitMethod(ACC_PUBLIC|ACC_BRIDGE, samMethodName, 300 mt.toMethodDescriptorString(), null, null); 301 mv.visitAnnotation(DESCR_HIDDEN, true); 302 new ForwardingMethodGenerator(mv).generate(mt); 303 } 304 } 305 306 if (isSerializable) 307 generateSerializationFriendlyMethods(); 308 else if (accidentallySerializable) 309 generateSerializationHostileMethods(); 310 311 cw.visitEnd(); 312 313 // Define the generated class in this VM. 314 315 final byte[] classBytes = cw.toByteArray(); 316 317 // If requested, dump out to a file for debugging purposes 318 if (dumper != null) { 319 AccessController.doPrivileged(new PrivilegedAction<>() { 320 @Override 321 public Void run() { 322 dumper.dumpClass(lambdaClassName, classBytes); 323 return null; 324 } 325 }, null, 326 new FilePermission("<<ALL FILES>>", "read, write"), 327 // createDirectories may need it 328 new PropertyPermission("user.dir", "read")); 329 } 330 331 return UNSAFE.defineAnonymousClass(targetClass, classBytes, null); 332 } 333 334 /** 335 * Generate the factory method for the class 336 */ generateFactory()337 private void generateFactory() { 338 MethodVisitor m = cw.visitMethod(ACC_PRIVATE | ACC_STATIC, NAME_FACTORY, invokedType.toMethodDescriptorString(), null, null); 339 m.visitCode(); 340 m.visitTypeInsn(NEW, lambdaClassName); 341 m.visitInsn(Opcodes.DUP); 342 int parameterCount = invokedType.parameterCount(); 343 for (int typeIndex = 0, varIndex = 0; typeIndex < parameterCount; typeIndex++) { 344 Class<?> argType = invokedType.parameterType(typeIndex); 345 m.visitVarInsn(getLoadOpcode(argType), varIndex); 346 varIndex += getParameterSize(argType); 347 } 348 m.visitMethodInsn(INVOKESPECIAL, lambdaClassName, NAME_CTOR, constructorType.toMethodDescriptorString(), false); 349 m.visitInsn(ARETURN); 350 m.visitMaxs(-1, -1); 351 m.visitEnd(); 352 } 353 354 /** 355 * Generate the constructor for the class 356 */ generateConstructor()357 private void generateConstructor() { 358 // Generate constructor 359 MethodVisitor ctor = cw.visitMethod(ACC_PRIVATE, NAME_CTOR, 360 constructorType.toMethodDescriptorString(), null, null); 361 ctor.visitCode(); 362 ctor.visitVarInsn(ALOAD, 0); 363 ctor.visitMethodInsn(INVOKESPECIAL, JAVA_LANG_OBJECT, NAME_CTOR, 364 METHOD_DESCRIPTOR_VOID, false); 365 int parameterCount = invokedType.parameterCount(); 366 for (int i = 0, lvIndex = 0; i < parameterCount; i++) { 367 ctor.visitVarInsn(ALOAD, 0); 368 Class<?> argType = invokedType.parameterType(i); 369 ctor.visitVarInsn(getLoadOpcode(argType), lvIndex + 1); 370 lvIndex += getParameterSize(argType); 371 ctor.visitFieldInsn(PUTFIELD, lambdaClassName, argNames[i], argDescs[i]); 372 } 373 ctor.visitInsn(RETURN); 374 // Maxs computed by ClassWriter.COMPUTE_MAXS, these arguments ignored 375 ctor.visitMaxs(-1, -1); 376 ctor.visitEnd(); 377 } 378 379 /** 380 * Generate a writeReplace method that supports serialization 381 */ generateSerializationFriendlyMethods()382 private void generateSerializationFriendlyMethods() { 383 TypeConvertingMethodAdapter mv 384 = new TypeConvertingMethodAdapter( 385 cw.visitMethod(ACC_PRIVATE + ACC_FINAL, 386 NAME_METHOD_WRITE_REPLACE, DESCR_METHOD_WRITE_REPLACE, 387 null, null)); 388 389 mv.visitCode(); 390 mv.visitTypeInsn(NEW, NAME_SERIALIZED_LAMBDA); 391 mv.visitInsn(DUP); 392 mv.visitLdcInsn(Type.getType(targetClass)); 393 mv.visitLdcInsn(invokedType.returnType().getName().replace('.', '/')); 394 mv.visitLdcInsn(samMethodName); 395 mv.visitLdcInsn(samMethodType.toMethodDescriptorString()); 396 mv.visitLdcInsn(implInfo.getReferenceKind()); 397 mv.visitLdcInsn(implInfo.getDeclaringClass().getName().replace('.', '/')); 398 mv.visitLdcInsn(implInfo.getName()); 399 mv.visitLdcInsn(implInfo.getMethodType().toMethodDescriptorString()); 400 mv.visitLdcInsn(instantiatedMethodType.toMethodDescriptorString()); 401 mv.iconst(argDescs.length); 402 mv.visitTypeInsn(ANEWARRAY, JAVA_LANG_OBJECT); 403 for (int i = 0; i < argDescs.length; i++) { 404 mv.visitInsn(DUP); 405 mv.iconst(i); 406 mv.visitVarInsn(ALOAD, 0); 407 mv.visitFieldInsn(GETFIELD, lambdaClassName, argNames[i], argDescs[i]); 408 mv.boxIfTypePrimitive(Type.getType(argDescs[i])); 409 mv.visitInsn(AASTORE); 410 } 411 mv.visitMethodInsn(INVOKESPECIAL, NAME_SERIALIZED_LAMBDA, NAME_CTOR, 412 DESCR_CTOR_SERIALIZED_LAMBDA, false); 413 mv.visitInsn(ARETURN); 414 // Maxs computed by ClassWriter.COMPUTE_MAXS, these arguments ignored 415 mv.visitMaxs(-1, -1); 416 mv.visitEnd(); 417 } 418 419 /** 420 * Generate a readObject/writeObject method that is hostile to serialization 421 */ generateSerializationHostileMethods()422 private void generateSerializationHostileMethods() { 423 MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_FINAL, 424 NAME_METHOD_WRITE_OBJECT, DESCR_METHOD_WRITE_OBJECT, 425 null, SER_HOSTILE_EXCEPTIONS); 426 mv.visitCode(); 427 mv.visitTypeInsn(NEW, NAME_NOT_SERIALIZABLE_EXCEPTION); 428 mv.visitInsn(DUP); 429 mv.visitLdcInsn("Non-serializable lambda"); 430 mv.visitMethodInsn(INVOKESPECIAL, NAME_NOT_SERIALIZABLE_EXCEPTION, NAME_CTOR, 431 DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION, false); 432 mv.visitInsn(ATHROW); 433 mv.visitMaxs(-1, -1); 434 mv.visitEnd(); 435 436 mv = cw.visitMethod(ACC_PRIVATE + ACC_FINAL, 437 NAME_METHOD_READ_OBJECT, DESCR_METHOD_READ_OBJECT, 438 null, SER_HOSTILE_EXCEPTIONS); 439 mv.visitCode(); 440 mv.visitTypeInsn(NEW, NAME_NOT_SERIALIZABLE_EXCEPTION); 441 mv.visitInsn(DUP); 442 mv.visitLdcInsn("Non-serializable lambda"); 443 mv.visitMethodInsn(INVOKESPECIAL, NAME_NOT_SERIALIZABLE_EXCEPTION, NAME_CTOR, 444 DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION, false); 445 mv.visitInsn(ATHROW); 446 mv.visitMaxs(-1, -1); 447 mv.visitEnd(); 448 } 449 450 /** 451 * This class generates a method body which calls the lambda implementation 452 * method, converting arguments, as needed. 453 */ 454 private class ForwardingMethodGenerator extends TypeConvertingMethodAdapter { 455 ForwardingMethodGenerator(MethodVisitor mv)456 ForwardingMethodGenerator(MethodVisitor mv) { 457 super(mv); 458 } 459 generate(MethodType methodType)460 void generate(MethodType methodType) { 461 visitCode(); 462 463 if (implKind == MethodHandleInfo.REF_newInvokeSpecial) { 464 visitTypeInsn(NEW, implMethodClassName); 465 visitInsn(DUP); 466 } 467 for (int i = 0; i < argNames.length; i++) { 468 visitVarInsn(ALOAD, 0); 469 visitFieldInsn(GETFIELD, lambdaClassName, argNames[i], argDescs[i]); 470 } 471 472 convertArgumentTypes(methodType); 473 474 // Invoke the method we want to forward to 475 visitMethodInsn(invocationOpcode(), implMethodClassName, 476 implMethodName, implMethodDesc, 477 implClass.isInterface()); 478 479 // Convert the return value (if any) and return it 480 // Note: if adapting from non-void to void, the 'return' 481 // instruction will pop the unneeded result 482 Class<?> implReturnClass = implMethodType.returnType(); 483 Class<?> samReturnClass = methodType.returnType(); 484 convertType(implReturnClass, samReturnClass, samReturnClass); 485 visitInsn(getReturnOpcode(samReturnClass)); 486 // Maxs computed by ClassWriter.COMPUTE_MAXS,these arguments ignored 487 visitMaxs(-1, -1); 488 visitEnd(); 489 } 490 convertArgumentTypes(MethodType samType)491 private void convertArgumentTypes(MethodType samType) { 492 int lvIndex = 0; 493 int samParametersLength = samType.parameterCount(); 494 int captureArity = invokedType.parameterCount(); 495 for (int i = 0; i < samParametersLength; i++) { 496 Class<?> argType = samType.parameterType(i); 497 visitVarInsn(getLoadOpcode(argType), lvIndex + 1); 498 lvIndex += getParameterSize(argType); 499 convertType(argType, implMethodType.parameterType(captureArity + i), instantiatedMethodType.parameterType(i)); 500 } 501 } 502 invocationOpcode()503 private int invocationOpcode() throws InternalError { 504 switch (implKind) { 505 case MethodHandleInfo.REF_invokeStatic: 506 return INVOKESTATIC; 507 case MethodHandleInfo.REF_newInvokeSpecial: 508 return INVOKESPECIAL; 509 case MethodHandleInfo.REF_invokeVirtual: 510 return INVOKEVIRTUAL; 511 case MethodHandleInfo.REF_invokeInterface: 512 return INVOKEINTERFACE; 513 case MethodHandleInfo.REF_invokeSpecial: 514 return INVOKESPECIAL; 515 default: 516 throw new InternalError("Unexpected invocation kind: " + implKind); 517 } 518 } 519 } 520 getParameterSize(Class<?> c)521 static int getParameterSize(Class<?> c) { 522 if (c == Void.TYPE) { 523 return 0; 524 } else if (c == Long.TYPE || c == Double.TYPE) { 525 return 2; 526 } 527 return 1; 528 } 529 getLoadOpcode(Class<?> c)530 static int getLoadOpcode(Class<?> c) { 531 if(c == Void.TYPE) { 532 throw new InternalError("Unexpected void type of load opcode"); 533 } 534 return ILOAD + getOpcodeOffset(c); 535 } 536 getReturnOpcode(Class<?> c)537 static int getReturnOpcode(Class<?> c) { 538 if(c == Void.TYPE) { 539 return RETURN; 540 } 541 return IRETURN + getOpcodeOffset(c); 542 } 543 getOpcodeOffset(Class<?> c)544 private static int getOpcodeOffset(Class<?> c) { 545 if (c.isPrimitive()) { 546 if (c == Long.TYPE) { 547 return 1; 548 } else if (c == Float.TYPE) { 549 return 2; 550 } else if (c == Double.TYPE) { 551 return 3; 552 } 553 return 0; 554 } else { 555 return 4; 556 } 557 } 558 559 } 560