2 * Copyright (c) 2019 PANTHEON.tech, s.r.o. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.mdsal.binding.dom.codec.impl;
10 import static com.google.common.base.Verify.verify;
11 import static com.google.common.base.Verify.verifyNotNull;
12 import static java.util.Objects.requireNonNull;
13 import static org.opendaylight.mdsal.binding.dom.codec.impl.ByteBuddyUtils.THIS;
14 import static org.opendaylight.mdsal.binding.dom.codec.impl.ByteBuddyUtils.getField;
15 import static org.opendaylight.mdsal.binding.dom.codec.impl.ByteBuddyUtils.invokeMethod;
16 import static org.opendaylight.mdsal.binding.dom.codec.impl.ByteBuddyUtils.putField;
18 import com.google.common.base.MoreObjects.ToStringHelper;
19 import com.google.common.base.Supplier;
20 import com.google.common.collect.ImmutableMap;
21 import com.google.common.collect.Maps;
22 import java.lang.reflect.Method;
23 import java.util.ArrayList;
24 import java.util.Arrays;
25 import java.util.Comparator;
26 import java.util.List;
28 import java.util.Map.Entry;
29 import java.util.Objects;
30 import java.util.Optional;
31 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
32 import net.bytebuddy.ByteBuddy;
33 import net.bytebuddy.description.field.FieldDescription;
34 import net.bytebuddy.description.method.MethodDescription;
35 import net.bytebuddy.description.type.TypeDefinition;
36 import net.bytebuddy.description.type.TypeDescription;
37 import net.bytebuddy.description.type.TypeDescription.Generic;
38 import net.bytebuddy.dynamic.DynamicType.Builder;
39 import net.bytebuddy.dynamic.scaffold.InstrumentedType;
40 import net.bytebuddy.implementation.Implementation;
41 import net.bytebuddy.implementation.Implementation.Context;
42 import net.bytebuddy.implementation.bytecode.Addition;
43 import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
44 import net.bytebuddy.implementation.bytecode.Multiplication;
45 import net.bytebuddy.implementation.bytecode.StackManipulation;
46 import net.bytebuddy.implementation.bytecode.assign.TypeCasting;
47 import net.bytebuddy.implementation.bytecode.constant.ClassConstant;
48 import net.bytebuddy.implementation.bytecode.constant.IntegerConstant;
49 import net.bytebuddy.implementation.bytecode.constant.TextConstant;
50 import net.bytebuddy.implementation.bytecode.member.MethodReturn;
51 import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
52 import net.bytebuddy.jar.asm.Label;
53 import net.bytebuddy.jar.asm.MethodVisitor;
54 import net.bytebuddy.jar.asm.Opcodes;
55 import org.eclipse.jdt.annotation.NonNull;
56 import org.eclipse.jdt.annotation.Nullable;
57 import org.opendaylight.mdsal.binding.dom.codec.impl.ClassGeneratorBridge.BridgeProvider;
58 import org.opendaylight.mdsal.binding.dom.codec.impl.ClassGeneratorBridge.LocalNameProvider;
59 import org.opendaylight.mdsal.binding.dom.codec.impl.ClassGeneratorBridge.NodeContextSupplierProvider;
60 import org.opendaylight.mdsal.binding.dom.codec.loader.CodecClassLoader;
61 import org.opendaylight.mdsal.binding.dom.codec.loader.CodecClassLoader.ClassGenerator;
62 import org.opendaylight.mdsal.binding.dom.codec.loader.CodecClassLoader.GeneratorResult;
63 import org.opendaylight.yangtools.yang.binding.DataObject;
64 import org.slf4j.Logger;
65 import org.slf4j.LoggerFactory;
68 * Private support for generating {@link CodecDataObject} and {@link AugmentableCodecDataObject} specializations.
71 * Code generation here is probably more involved than usual mainly due to the fact we *really* want to express the
72 * strong connection between a generated class and BindingCodecContext in terms of a true constant, which boils down to
73 * {@code private static final NodeContextSupplier NCS}. Having such constants provides significant boost to JITs
74 * ability to optimize code -- especially with inlining and constant propagation.
77 * The accessor mapping performance is critical due to users typically not taking care of storing the results acquired
78 * by an invocation, assuming the accessors are backed by a normal field -- which of course is not true, as the results
79 * are lazily computed.
82 * The design is such that for a particular structure like:
90 * we end up generating a class with the following layout:
92 * public final class Foo$$$codecImpl extends CodecDataObject implements Foo {
93 * private static final AtomicRefereceFieldUpdater<Foo$$$codecImpl, Object> getBar$$$A;
94 * private volatile Object getBar;
96 * public Foo$$$codecImpl(NormalizedNodeContainer data) {
100 * public Bar getBar() {
101 * return (Bar) codecMember(getBar$$$A, "bar");
107 * This strategy minimizes the bytecode footprint and follows the generally good idea of keeping common logic in a
108 * single place in a maintainable form. The glue code is extremely light (~6 instructions), which is beneficial on both
109 * sides of invocation:
110 * - generated method can readily be inlined into the caller
111 * - it forms a call site into which codeMember() can be inlined with AtomicReferenceFieldUpdater being constant
114 * The second point is important here, as it allows the invocation logic around AtomicRefereceFieldUpdater to completely
115 * disappear, becoming synonymous with operations of a volatile field.
118 * Furthermore there are distinct {@code codecMember} methods, each of which supports a different invocation style:
120 * <li>with {@code String}, which ends up looking up a {@link ValueNodeCodecContext}</li>
121 * <li>with {@code Class}, which ends up looking up a {@link DataContainerCodecContext}</li>
122 * <li>with {@code NodeContextSupplier}, which performs a direct load</li>
124 * The third mode of operation requires that the object being implemented is not defined in a {@code grouping}, because
125 * it welds the object to a particular namespace -- hence it trades namespace mobility for access speed.
128 * The sticky point here is the NodeContextSupplier, as it is a heap object which cannot normally be looked up from the
129 * static context in which the static class initializer operates -- so we need perform some sort of a trick here.
130 * Eventhough ByteBuddy provides facilities for bridging references to type fields, those facilities operate on volatile
131 * fields -- hence they do not quite work for us.
134 * Another alternative, which we used in Javassist-generated DataObjectSerializers, is to muck with the static field
135 * using reflection -- which works, but requires redefinition of Field.modifiers, which is something Java 9 complains
136 * about quite noisily.
139 * We take a different approach here, which takes advantage of the fact we are in control of both code generation (here)
140 * and class loading (in {@link CodecClassLoader}). The process is performed in four steps:
142 * <li>During code generation, the context fields are pointed towards
143 * {@link ClassGeneratorBridge#resolveNodeContextSupplier(String)} and
144 * {@link ClassGeneratorBridge#resolveKey(String)} methods, which are public and static, hence perfectly usable
145 * in the context of a class initializer.</li>
146 * <li>During class loading of generated byte code, the original instance of the generator is called to wrap the actual
147 * class loading operation. At this point the generator installs itself as the current generator for this thread via
148 * {@link ClassGeneratorBridge#setup(CodecDataObjectGenerator)} and allows the class to be loaded.
149 * <li>After the class has been loaded, but before the call returns, we will force the class to initialize, at which
150 * point the static invocations will be redirect to {@link #resolveNodeContextSupplier(String)} and
151 * {@link #resolveKey(String)} methods, thus initializing the fields to the intended constants.</li>
152 * <li>Before returning from the class loading call, the generator will detach itself via
153 * {@link ClassGeneratorBridge#tearDown(CodecDataObjectGenerator)}.</li>
157 * This strategy works due to close cooperation with the target ClassLoader, as the entire code generation and loading
158 * block runs with the class loading lock for this FQCN and the reference is not leaked until the process completes.
160 abstract class CodecDataObjectGenerator<T extends CodecDataObject<?>> implements ClassGenerator<T>, BridgeProvider {
161 // Not reusable defintion: we can inline NodeContextSuppliers without a problem
162 private static final class Fixed<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
163 implements NodeContextSupplierProvider {
164 private final ImmutableMap<Method, NodeContextSupplier> properties;
166 Fixed(final Builder<?> template, final ImmutableMap<Method, NodeContextSupplier> properties,
167 final @Nullable Method keyMethod) {
168 super(template, keyMethod);
169 this.properties = requireNonNull(properties);
173 Builder<T> generateGetters(final Builder<T> builder) {
174 Builder<T> tmp = builder;
175 for (Method method : properties.keySet()) {
176 LOG.trace("Generating for fixed method {}", method);
177 final String methodName = method.getName();
178 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
179 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
180 new SupplierGetterMethodImplementation(methodName, retType));
186 ArrayList<Method> getterMethods() {
187 return new ArrayList<>(properties.keySet());
191 public NodeContextSupplier resolveNodeContextSupplier(final String methodName) {
192 final Optional<Entry<Method, NodeContextSupplier>> found = properties.entrySet().stream()
193 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
194 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
195 return verifyNotNull(found.get().getValue());
199 // Reusable definition: we have to rely on context lookups
200 private static final class Reusable<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
201 implements LocalNameProvider {
202 private final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties;
203 private final Map<Method, Class<?>> daoProperties;
205 Reusable(final Builder<?> template, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
206 final Map<Method, Class<?>> daoProperties, final @Nullable Method keyMethod) {
207 super(template, keyMethod);
208 this.simpleProperties = requireNonNull(simpleProperties);
209 this.daoProperties = requireNonNull(daoProperties);
213 Builder<T> generateGetters(final Builder<T> builder) {
214 Builder<T> tmp = builder;
215 for (Method method : simpleProperties.keySet()) {
216 LOG.trace("Generating for simple method {}", method);
217 final String methodName = method.getName();
218 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
219 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
220 new SimpleGetterMethodImplementation(methodName, retType));
222 for (Entry<Method, Class<?>> entry : daoProperties.entrySet()) {
223 final Method method = entry.getKey();
224 LOG.trace("Generating for structured method {}", method);
225 final String methodName = method.getName();
226 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
227 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
228 new StructuredGetterMethodImplementation(methodName, retType, entry.getValue()));
235 ArrayList<Method> getterMethods() {
236 final ArrayList<Method> ret = new ArrayList<>(simpleProperties.size() + daoProperties.size());
237 ret.addAll(simpleProperties.keySet());
238 ret.addAll(daoProperties.keySet());
243 public String resolveLocalName(final String methodName) {
244 final Optional<Entry<Method, ValueNodeCodecContext>> found = simpleProperties.entrySet().stream()
245 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
246 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
247 return found.get().getValue().getSchema().getQName().getLocalName();
251 private static final Logger LOG = LoggerFactory.getLogger(CodecDataObjectGenerator.class);
252 private static final Generic BB_BOOLEAN = TypeDefinition.Sort.describe(boolean.class);
253 private static final Generic BB_DATAOBJECT = TypeDefinition.Sort.describe(DataObject.class);
254 private static final Generic BB_HELPER = TypeDefinition.Sort.describe(ToStringHelper.class);
255 private static final Generic BB_INT = TypeDefinition.Sort.describe(int.class);
256 private static final Comparator<Method> METHOD_BY_ALPHABET = Comparator.comparing(Method::getName);
258 private static final StackManipulation ARRAYS_EQUALS = invokeMethod(Arrays.class, "equals",
259 byte[].class, byte[].class);
260 private static final StackManipulation OBJECTS_EQUALS = invokeMethod(Objects.class, "equals",
261 Object.class, Object.class);
262 private static final StackManipulation HELPER_ADD = invokeMethod(ToStringHelper.class, "add",
263 String.class, Object.class);
265 private static final StackManipulation FIRST_ARG_REF = MethodVariableAccess.REFERENCE.loadFrom(1);
267 private static final int PROT_FINAL = Opcodes.ACC_PROTECTED | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
268 private static final int PUB_FINAL = Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
270 private static final Builder<?> CDO;
271 private static final Builder<?> ACDO;
274 final ByteBuddy bb = new ByteBuddy();
275 CDO = bb.subclass(CodecDataObject.class).visit(ByteBuddyUtils.computeFrames());
276 ACDO = bb.subclass(AugmentableCodecDataObject.class).visit(ByteBuddyUtils.computeFrames());
279 private final Builder<?> template;
280 private final Method keyMethod;
282 private CodecDataObjectGenerator(final Builder<?> template, final @Nullable Method keyMethod) {
283 this.template = requireNonNull(template);
284 this.keyMethod = keyMethod;
287 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generate(final CodecClassLoader loader,
288 final Class<D> bindingInterface, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
289 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
290 return loader.generateClass(bindingInterface, "codecImpl",
291 new Reusable<>(CDO, simpleProperties, daoProperties, keyMethod));
294 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generateAugmentable(
295 final CodecClassLoader loader, final Class<D> bindingInterface,
296 final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
297 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
298 return loader.generateClass(bindingInterface, "codecImpl",
299 new Reusable<>(ACDO, simpleProperties, daoProperties, keyMethod));
303 public final GeneratorResult<T> generateClass(final CodecClassLoader loeader, final String fqcn,
304 final Class<?> bindingInterface) {
305 LOG.trace("Generating class {}", fqcn);
307 @SuppressWarnings("unchecked")
308 Builder<T> builder = (Builder<T>) template.name(fqcn).implement(bindingInterface);
310 builder = generateGetters(builder);
312 if (keyMethod != null) {
313 LOG.trace("Generating for key {}", keyMethod);
314 final String methodName = keyMethod.getName();
315 final TypeDescription retType = TypeDescription.ForLoadedType.of(keyMethod.getReturnType());
316 builder = builder.defineMethod(methodName, retType, PUB_FINAL).intercept(
317 new KeyMethodImplementation(methodName, retType));
320 // Index all property methods, turning them into "getFoo()" invocations, retaining order. We will be using
321 // those invocations in each of the three methods. Note that we do not glue the invocations to 'this', as we
322 // will be invoking them on 'other' in codecEquals()
323 final ArrayList<Method> properties = getterMethods();
324 // Make sure properties are alpha-sorted
325 properties.sort(METHOD_BY_ALPHABET);
326 final ImmutableMap<StackManipulation, Method> methods = Maps.uniqueIndex(properties,
327 ByteBuddyUtils::invokeMethod);
330 return GeneratorResult.of(builder
331 // codecHashCode() ...
332 .defineMethod("codecHashCode", BB_INT, PROT_FINAL)
333 .intercept(new Implementation.Simple(new CodecHashCode(methods)))
334 // ... codecEquals() ...
335 .defineMethod("codecEquals", BB_BOOLEAN, PROT_FINAL).withParameter(BB_DATAOBJECT)
336 .intercept(codecEquals(methods))
337 // ... and codecFillToString() ...
338 .defineMethod("codecFillToString", BB_HELPER, PROT_FINAL).withParameter(BB_HELPER)
339 .intercept(codecFillToString(methods))
345 public Class<T> customizeLoading(final @NonNull Supplier<Class<T>> loader) {
346 final BridgeProvider prev = ClassGeneratorBridge.setup(this);
348 final Class<T> result = loader.get();
351 * This a bit of magic to support NodeContextSupplier constants. These constants need to be resolved
352 * while we have the information needed to find them -- that information is being held in this instance
353 * and we leak it to a thread-local variable held by CodecDataObjectBridge.
355 * By default the JVM will defer class initialization to first use, which unfortunately is too late for
356 * us, and hence we need to force class to initialize.
359 Class.forName(result.getName(), true, result.getClassLoader());
360 } catch (ClassNotFoundException e) {
361 throw new LinkageError("Failed to find newly-defined " + result, e);
366 ClassGeneratorBridge.tearDown(prev);
370 abstract Builder<T> generateGetters(Builder<T> builder);
372 abstract ArrayList<Method> getterMethods();
374 private static Implementation codecEquals(final ImmutableMap<StackManipulation, Method> properties) {
375 // Label for 'return false;'
376 final Label falseLabel = new Label();
377 // Condition for 'if (!...)'
378 final StackManipulation ifFalse = ByteBuddyUtils.ifEq(falseLabel);
380 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 6 + 5);
381 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
382 // if (!java.util.(Objects|Arrays).equals(getFoo(), other.getFoo())) {
385 manipulations.add(THIS);
386 manipulations.add(entry.getKey());
387 manipulations.add(FIRST_ARG_REF);
388 manipulations.add(entry.getKey());
389 manipulations.add(entry.getValue().getReturnType().isArray() ? ARRAYS_EQUALS : OBJECTS_EQUALS);
390 manipulations.add(ifFalse);
394 manipulations.add(IntegerConstant.ONE);
395 manipulations.add(MethodReturn.INTEGER);
397 manipulations.add(ByteBuddyUtils.markLabel(falseLabel));
398 manipulations.add(IntegerConstant.ZERO);
399 manipulations.add(MethodReturn.INTEGER);
401 return new Implementation.Simple(manipulations.toArray(new StackManipulation[0]));
404 private static Implementation codecFillToString(final ImmutableMap<StackManipulation, Method> properties) {
405 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 4 + 2);
406 // push 'return helper' to stack...
407 manipulations.add(FIRST_ARG_REF);
408 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
409 // .add("getFoo", getFoo())
410 manipulations.add(new TextConstant(entry.getValue().getName()));
411 manipulations.add(THIS);
412 manipulations.add(entry.getKey());
413 manipulations.add(HELPER_ADD);
415 // ... execute 'return helper'
416 manipulations.add(MethodReturn.REFERENCE);
418 return new Implementation.Simple(manipulations.toArray(new StackManipulation[0]));
421 private abstract static class AbstractMethodImplementation implements Implementation {
422 private static final Generic BB_ARFU = TypeDefinition.Sort.describe(AtomicReferenceFieldUpdater.class);
423 private static final Generic BB_OBJECT = TypeDefinition.Sort.describe(Object.class);
424 private static final StackManipulation OBJECT_CLASS = ClassConstant.of(TypeDescription.OBJECT);
425 private static final StackManipulation ARFU_NEWUPDATER = invokeMethod(AtomicReferenceFieldUpdater.class,
426 "newUpdater", Class.class, Class.class, String.class);
428 static final int PRIV_CONST = Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC | Opcodes.ACC_FINAL
429 | Opcodes.ACC_SYNTHETIC;
430 private static final int PRIV_VOLATILE = Opcodes.ACC_PRIVATE | Opcodes.ACC_VOLATILE | Opcodes.ACC_SYNTHETIC;
432 final TypeDescription retType;
434 final String methodName;
436 final String arfuName;
438 AbstractMethodImplementation(final String methodName, final TypeDescription retType) {
439 this.methodName = requireNonNull(methodName);
440 this.retType = requireNonNull(retType);
441 this.arfuName = methodName + "$$$A";
445 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
446 final InstrumentedType tmp = instrumentedType
447 // private static final AtomicReferenceFieldUpdater<This, Object> getFoo$$$A;
448 .withField(new FieldDescription.Token(arfuName, PRIV_CONST, BB_ARFU))
449 // private volatile Object getFoo;
450 .withField(new FieldDescription.Token(methodName, PRIV_VOLATILE, BB_OBJECT));
452 return tmp.withInitializer(new ByteCodeAppender.Simple(
453 // getFoo$$$A = AtomicReferenceFieldUpdater.newUpdater(This.class, Object.class, "getFoo");
454 ClassConstant.of(tmp),
456 new TextConstant(methodName),
458 putField(tmp, arfuName)));
462 private static final class KeyMethodImplementation extends AbstractMethodImplementation {
463 private static final StackManipulation CODEC_KEY = invokeMethod(CodecDataObject.class,
464 "codecKey", AtomicReferenceFieldUpdater.class);
466 KeyMethodImplementation(final String methodName, final TypeDescription retType) {
467 super(methodName, retType);
471 public ByteCodeAppender appender(final Target implementationTarget) {
472 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
473 return new ByteCodeAppender.Simple(
474 // return (FooType) codecKey(getFoo$$$A);
476 getField(instrumentedType, arfuName),
478 TypeCasting.to(retType),
479 MethodReturn.REFERENCE);
484 * A simple leaf method, which looks up child by a String constant. This is slightly more complicated because we
485 * want to make sure we are using the same String instance as the one stored in associated DataObjectCodecContext,
486 * so that during lookup we perform an identity check instead of comparing content -- speeding things up as well
487 * as minimizing footprint. Since that string is not guaranteed to be interned in the String Pool, we cannot rely
488 * on the constant pool entry to resolve to the same object.
490 private static final class SimpleGetterMethodImplementation extends AbstractMethodImplementation {
491 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
492 "codecMember", AtomicReferenceFieldUpdater.class, String.class);
493 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
494 "resolveLocalName", String.class);
495 private static final Generic BB_STRING = TypeDefinition.Sort.describe(String.class);
498 private final String stringName;
500 SimpleGetterMethodImplementation(final String methodName, final TypeDescription retType) {
501 super(methodName, retType);
502 this.stringName = methodName + "$$$S";
506 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
507 final InstrumentedType tmp = super.prepare(instrumentedType)
508 // private static final String getFoo$$$S;
509 .withField(new FieldDescription.Token(stringName, PRIV_CONST, BB_STRING));
511 return tmp.withInitializer(new ByteCodeAppender.Simple(
512 // getFoo$$$S = CodecDataObjectBridge.resolveString("getFoo");
513 new TextConstant(methodName),
515 putField(tmp, stringName)));
519 public ByteCodeAppender appender(final Target implementationTarget) {
520 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
521 return new ByteCodeAppender.Simple(
522 // return (FooType) codecMember(getFoo$$$A, getFoo$$$S);
524 getField(instrumentedType, arfuName),
525 getField(instrumentedType, stringName),
527 TypeCasting.to(retType),
528 MethodReturn.REFERENCE);
532 private static final class StructuredGetterMethodImplementation extends AbstractMethodImplementation {
533 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
534 "codecMember", AtomicReferenceFieldUpdater.class, Class.class);
536 private final Class<?> bindingClass;
538 StructuredGetterMethodImplementation(final String methodName, final TypeDescription retType,
539 final Class<?> bindingClass) {
540 super(methodName, retType);
541 this.bindingClass = requireNonNull(bindingClass);
545 public ByteCodeAppender appender(final Target implementationTarget) {
546 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
547 return new ByteCodeAppender.Simple(
548 // return (FooType) codecMember(getFoo$$$A, FooType.class);
550 getField(instrumentedType, arfuName),
551 ClassConstant.of(TypeDefinition.Sort.describe(bindingClass).asErasure()),
553 TypeCasting.to(retType),
554 MethodReturn.REFERENCE);
558 private static final class SupplierGetterMethodImplementation extends AbstractMethodImplementation {
559 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
560 "codecMember", AtomicReferenceFieldUpdater.class, NodeContextSupplier.class);
561 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
562 "resolveNodeContextSupplier", String.class);
563 private static final Generic BB_NCS = TypeDefinition.Sort.describe(NodeContextSupplier.class);
566 private final String contextName;
568 SupplierGetterMethodImplementation(final String methodName, final TypeDescription retType) {
569 super(methodName, retType);
570 contextName = methodName + "$$$C";
574 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
575 final InstrumentedType tmp = super.prepare(instrumentedType)
576 // private static final NodeContextSupplier getFoo$$$C;
577 .withField(new FieldDescription.Token(contextName, PRIV_CONST, BB_NCS));
579 return tmp.withInitializer(new ByteCodeAppender.Simple(
580 // getFoo$$$C = CodecDataObjectBridge.resolve("getFoo");
581 new TextConstant(methodName),
583 putField(tmp, contextName)));
587 public ByteCodeAppender appender(final Target implementationTarget) {
588 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
589 return new ByteCodeAppender.Simple(
590 // return (FooType) codecMember(getFoo$$$A, getFoo$$$C);
592 getField(instrumentedType, arfuName),
593 getField(instrumentedType, contextName),
595 TypeCasting.to(retType),
596 MethodReturn.REFERENCE);
600 private static final class CodecHashCode implements ByteCodeAppender {
601 private static final StackManipulation THIRTY_ONE = IntegerConstant.forValue(31);
602 private static final StackManipulation LOAD_RESULT = MethodVariableAccess.INTEGER.loadFrom(1);
603 private static final StackManipulation STORE_RESULT = MethodVariableAccess.INTEGER.storeAt(1);
604 private static final StackManipulation ARRAYS_HASHCODE = invokeMethod(Arrays.class, "hashCode", byte[].class);
605 private static final StackManipulation OBJECTS_HASHCODE = invokeMethod(Objects.class, "hashCode", Object.class);
607 private final ImmutableMap<StackManipulation, Method> properties;
609 CodecHashCode(final ImmutableMap<StackManipulation, Method> properties) {
610 this.properties = requireNonNull(properties);
614 public Size apply(final MethodVisitor methodVisitor, final Context implementationContext,
615 final MethodDescription instrumentedMethod) {
616 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 8 + 4);
618 manipulations.add(IntegerConstant.ONE);
619 manipulations.add(STORE_RESULT);
621 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
622 // result = 31 * result + java.util.(Objects,Arrays).hashCode(getFoo());
623 manipulations.add(THIRTY_ONE);
624 manipulations.add(LOAD_RESULT);
625 manipulations.add(Multiplication.INTEGER);
626 manipulations.add(THIS);
627 manipulations.add(entry.getKey());
628 manipulations.add(entry.getValue().getReturnType().isArray() ? ARRAYS_HASHCODE : OBJECTS_HASHCODE);
629 manipulations.add(Addition.INTEGER);
630 manipulations.add(STORE_RESULT);
633 manipulations.add(LOAD_RESULT);
634 manipulations.add(MethodReturn.INTEGER);
636 StackManipulation.Size operandStackSize = new StackManipulation.Compound(manipulations)
637 .apply(methodVisitor, implementationContext);
638 return new Size(operandStackSize.getMaximalSize(), instrumentedMethod.getStackSize() + 1);