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.collect.ImmutableMap;
20 import com.google.common.collect.Maps;
21 import java.lang.invoke.MethodHandles;
22 import java.lang.invoke.MethodHandles.Lookup;
23 import java.lang.invoke.VarHandle;
24 import java.lang.reflect.Method;
25 import java.util.ArrayList;
26 import java.util.Arrays;
27 import java.util.Comparator;
28 import java.util.List;
30 import java.util.Map.Entry;
31 import java.util.Objects;
32 import java.util.Optional;
33 import net.bytebuddy.ByteBuddy;
34 import net.bytebuddy.description.field.FieldDescription;
35 import net.bytebuddy.description.method.MethodDescription;
36 import net.bytebuddy.description.type.TypeDefinition;
37 import net.bytebuddy.description.type.TypeDescription;
38 import net.bytebuddy.description.type.TypeDescription.Generic;
39 import net.bytebuddy.dynamic.DynamicType.Builder;
40 import net.bytebuddy.dynamic.scaffold.InstrumentedType;
41 import net.bytebuddy.implementation.Implementation;
42 import net.bytebuddy.implementation.Implementation.Context;
43 import net.bytebuddy.implementation.bytecode.Addition;
44 import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
45 import net.bytebuddy.implementation.bytecode.Multiplication;
46 import net.bytebuddy.implementation.bytecode.StackManipulation;
47 import net.bytebuddy.implementation.bytecode.assign.TypeCasting;
48 import net.bytebuddy.implementation.bytecode.constant.ClassConstant;
49 import net.bytebuddy.implementation.bytecode.constant.IntegerConstant;
50 import net.bytebuddy.implementation.bytecode.constant.TextConstant;
51 import net.bytebuddy.implementation.bytecode.member.MethodReturn;
52 import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
53 import net.bytebuddy.jar.asm.Label;
54 import net.bytebuddy.jar.asm.MethodVisitor;
55 import net.bytebuddy.jar.asm.Opcodes;
56 import org.eclipse.jdt.annotation.Nullable;
57 import org.opendaylight.mdsal.binding.dom.codec.impl.ClassGeneratorBridge.LocalNameProvider;
58 import org.opendaylight.mdsal.binding.dom.codec.impl.ClassGeneratorBridge.NodeContextSupplierProvider;
59 import org.opendaylight.mdsal.binding.dom.codec.loader.CodecClassLoader;
60 import org.opendaylight.mdsal.binding.dom.codec.loader.CodecClassLoader.ClassGenerator;
61 import org.opendaylight.mdsal.binding.dom.codec.loader.CodecClassLoader.GeneratorResult;
62 import org.opendaylight.yangtools.yang.binding.DataObject;
63 import org.slf4j.Logger;
64 import org.slf4j.LoggerFactory;
67 * Private support for generating {@link CodecDataObject} and {@link AugmentableCodecDataObject} specializations.
70 * Code generation here is probably more involved than usual mainly due to the fact we *really* want to express the
71 * strong connection between a generated class and BindingCodecContext in terms of a true constant, which boils down to
72 * {@code private static final NodeContextSupplier NCS}. Having such constants provides significant boost to JITs
73 * ability to optimize code -- especially with inlining and constant propagation.
76 * The accessor mapping performance is critical due to users typically not taking care of storing the results acquired
77 * by an invocation, assuming the accessors are backed by a normal field -- which of course is not true, as the results
78 * are lazily computed.
81 * The design is such that for a particular structure like:
89 * we end up generating a class with the following layout:
91 * public final class Foo$$$codecImpl extends CodecDataObject implements Foo {
92 * private static final VarHandle getBar$$$V;
93 * private volatile Object getBar;
95 * public Foo$$$codecImpl(NormalizedNodeContainer data) {
99 * public Bar getBar() {
100 * return (Bar) codecMember(getBar$$$V, "bar");
106 * This strategy minimizes the bytecode footprint and follows the generally good idea of keeping common logic in a
107 * single place in a maintainable form. The glue code is extremely light (~6 instructions), which is beneficial on both
108 * sides of invocation:
109 * - generated method can readily be inlined into the caller
110 * - it forms a call site into which codeMember() can be inlined with VarHandle being constant
113 * The second point is important here, as it allows the invocation logic around VarHandle to completely disappear,
114 * becoming synonymous with operations on a field. Even though the field itself is declared as volatile, it is only ever
115 * accessed through helper method using VarHandles -- and those helpers are using relaxed field ordering
116 * of {@code getAcquire()}/{@code setRelease()} memory semantics.
119 * Furthermore there are distinct {@code codecMember} methods, each of which supports a different invocation style:
121 * <li>with {@code String}, which ends up looking up a {@link ValueNodeCodecContext}</li>
122 * <li>with {@code Class}, which ends up looking up a {@link DataContainerCodecContext}</li>
123 * <li>with {@code NodeContextSupplier}, which performs a direct load</li>
125 * The third mode of operation requires that the object being implemented is not defined in a {@code grouping}, because
126 * it welds the object to a particular namespace -- hence it trades namespace mobility for access speed.
129 * The sticky point here is the NodeContextSupplier, as it is a heap object which cannot normally be looked up from the
130 * static context in which the static class initializer operates -- so we need perform some sort of a trick here.
131 * Eventhough ByteBuddy provides facilities for bridging references to type fields, those facilities operate on volatile
132 * fields -- hence they do not quite work for us.
135 * Another alternative, which we used in Javassist-generated DataObjectSerializers, is to muck with the static field
136 * using reflection -- which works, but requires redefinition of Field.modifiers, which is something Java 9 complains
137 * about quite noisily.
140 * We take a different approach here, which takes advantage of the fact we are in control of both code generation (here)
141 * and class loading (in {@link CodecClassLoader}). The process is performed in four steps:
143 * <li>During code generation, the context fields are pointed towards
144 * {@link ClassGeneratorBridge#resolveNodeContextSupplier(String)} and
145 * {@link ClassGeneratorBridge#resolveKey(String)} methods, which are public and static, hence perfectly usable
146 * in the context of a class initializer.</li>
147 * <li>During class loading of generated byte code, the original instance of the generator is called to wrap the actual
148 * class loading operation. At this point the generator installs itself as the current generator for this thread via
149 * {@link ClassGeneratorBridge#setup(CodecDataObjectGenerator)} and allows the class to be loaded.
150 * <li>After the class has been loaded, but before the call returns, we will force the class to initialize, at which
151 * point the static invocations will be redirect to {@link #resolveNodeContextSupplier(String)} and
152 * {@link #resolveKey(String)} methods, thus initializing the fields to the intended constants.</li>
153 * <li>Before returning from the class loading call, the generator will detach itself via
154 * {@link ClassGeneratorBridge#tearDown(CodecDataObjectGenerator)}.</li>
158 * This strategy works due to close cooperation with the target ClassLoader, as the entire code generation and loading
159 * block runs with the class loading lock for this FQCN and the reference is not leaked until the process completes.
161 abstract class CodecDataObjectGenerator<T extends CodecDataObject<?>> implements ClassGenerator<T> {
162 // Not reusable definition: we can inline NodeContextSuppliers without a problem
163 private static final class Fixed<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
164 implements NodeContextSupplierProvider<T> {
165 private final ImmutableMap<Method, NodeContextSupplier> properties;
167 Fixed(final Builder<?> template, final ImmutableMap<Method, NodeContextSupplier> properties,
168 final @Nullable Method keyMethod) {
169 super(template, keyMethod);
170 this.properties = requireNonNull(properties);
174 Builder<T> generateGetters(final Builder<T> builder) {
175 Builder<T> tmp = builder;
176 for (Method method : properties.keySet()) {
177 LOG.trace("Generating for fixed method {}", method);
178 final String methodName = method.getName();
179 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
180 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
181 new SupplierGetterMethodImplementation(methodName, retType));
187 ArrayList<Method> getterMethods() {
188 return new ArrayList<>(properties.keySet());
192 public NodeContextSupplier resolveNodeContextSupplier(final String methodName) {
193 final Optional<Entry<Method, NodeContextSupplier>> found = properties.entrySet().stream()
194 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
195 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
196 return verifyNotNull(found.get().getValue());
200 // Reusable definition: we have to rely on context lookups
201 private static final class Reusable<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
202 implements LocalNameProvider<T> {
203 private final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties;
204 private final Map<Method, Class<?>> daoProperties;
206 Reusable(final Builder<?> template, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
207 final Map<Method, Class<?>> daoProperties, final @Nullable Method keyMethod) {
208 super(template, keyMethod);
209 this.simpleProperties = requireNonNull(simpleProperties);
210 this.daoProperties = requireNonNull(daoProperties);
214 Builder<T> generateGetters(final Builder<T> builder) {
215 Builder<T> tmp = builder;
216 for (Method method : simpleProperties.keySet()) {
217 LOG.trace("Generating for simple method {}", method);
218 final String methodName = method.getName();
219 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
220 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
221 new SimpleGetterMethodImplementation(methodName, retType));
223 for (Entry<Method, Class<?>> entry : daoProperties.entrySet()) {
224 final Method method = entry.getKey();
225 LOG.trace("Generating for structured method {}", method);
226 final String methodName = method.getName();
227 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
228 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
229 new StructuredGetterMethodImplementation(methodName, retType, entry.getValue()));
236 ArrayList<Method> getterMethods() {
237 final ArrayList<Method> ret = new ArrayList<>(simpleProperties.size() + daoProperties.size());
238 ret.addAll(simpleProperties.keySet());
239 ret.addAll(daoProperties.keySet());
244 public String resolveLocalName(final String methodName) {
245 final Optional<Entry<Method, ValueNodeCodecContext>> found = simpleProperties.entrySet().stream()
246 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
247 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
248 return found.get().getValue().getSchema().getQName().getLocalName();
252 private static final Logger LOG = LoggerFactory.getLogger(CodecDataObjectGenerator.class);
253 private static final Generic BB_BOOLEAN = TypeDefinition.Sort.describe(boolean.class);
254 private static final Generic BB_DATAOBJECT = TypeDefinition.Sort.describe(DataObject.class);
255 private static final Generic BB_HELPER = TypeDefinition.Sort.describe(ToStringHelper.class);
256 private static final Generic BB_INT = TypeDefinition.Sort.describe(int.class);
257 private static final Comparator<Method> METHOD_BY_ALPHABET = Comparator.comparing(Method::getName);
259 private static final StackManipulation ARRAYS_EQUALS = invokeMethod(Arrays.class, "equals",
260 byte[].class, byte[].class);
261 private static final StackManipulation OBJECTS_EQUALS = invokeMethod(Objects.class, "equals",
262 Object.class, Object.class);
263 private static final StackManipulation HELPER_ADD = invokeMethod(ToStringHelper.class, "add",
264 String.class, Object.class);
266 private static final StackManipulation FIRST_ARG_REF = MethodVariableAccess.REFERENCE.loadFrom(1);
268 private static final int PROT_FINAL = Opcodes.ACC_PROTECTED | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
269 private static final int PUB_FINAL = Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
271 private static final Builder<?> CDO;
272 private static final Builder<?> ACDO;
275 final ByteBuddy bb = new ByteBuddy();
276 CDO = bb.subclass(CodecDataObject.class).visit(ByteBuddyUtils.computeFrames());
277 ACDO = bb.subclass(AugmentableCodecDataObject.class).visit(ByteBuddyUtils.computeFrames());
280 private final Builder<?> template;
281 private final Method keyMethod;
283 CodecDataObjectGenerator(final Builder<?> template, final @Nullable Method keyMethod) {
284 this.template = requireNonNull(template);
285 this.keyMethod = keyMethod;
288 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generate(final CodecClassLoader loader,
289 final Class<D> bindingInterface, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
290 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
291 return loader.generateClass(bindingInterface, "codecImpl",
292 new Reusable<>(CDO, simpleProperties, daoProperties, keyMethod));
295 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generateAugmentable(
296 final CodecClassLoader loader, final Class<D> bindingInterface,
297 final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
298 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
299 return loader.generateClass(bindingInterface, "codecImpl",
300 new Reusable<>(ACDO, simpleProperties, daoProperties, keyMethod));
304 public final GeneratorResult<T> generateClass(final CodecClassLoader loeader, final String fqcn,
305 final Class<?> bindingInterface) {
306 LOG.trace("Generating class {}", fqcn);
308 @SuppressWarnings("unchecked")
309 Builder<T> builder = (Builder<T>) template.name(fqcn).implement(bindingInterface);
311 builder = generateGetters(builder);
313 if (keyMethod != null) {
314 LOG.trace("Generating for key {}", keyMethod);
315 final String methodName = keyMethod.getName();
316 final TypeDescription retType = TypeDescription.ForLoadedType.of(keyMethod.getReturnType());
317 builder = builder.defineMethod(methodName, retType, PUB_FINAL).intercept(
318 new KeyMethodImplementation(methodName, retType));
321 // Index all property methods, turning them into "getFoo()" invocations, retaining order. We will be using
322 // those invocations in each of the three methods. Note that we do not glue the invocations to 'this', as we
323 // will be invoking them on 'other' in codecEquals()
324 final ArrayList<Method> properties = getterMethods();
325 // Make sure properties are alpha-sorted
326 properties.sort(METHOD_BY_ALPHABET);
327 final ImmutableMap<StackManipulation, Method> methods = Maps.uniqueIndex(properties,
328 ByteBuddyUtils::invokeMethod);
331 return GeneratorResult.of(builder
332 // codecHashCode() ...
333 .defineMethod("codecHashCode", BB_INT, PROT_FINAL)
334 .intercept(new Implementation.Simple(new CodecHashCode(methods)))
335 // ... codecEquals() ...
336 .defineMethod("codecEquals", BB_BOOLEAN, PROT_FINAL).withParameter(BB_DATAOBJECT)
337 .intercept(codecEquals(methods))
338 // ... and codecFillToString() ...
339 .defineMethod("codecFillToString", BB_HELPER, PROT_FINAL).withParameter(BB_HELPER)
340 .intercept(codecFillToString(methods))
345 abstract Builder<T> generateGetters(Builder<T> builder);
347 abstract ArrayList<Method> getterMethods();
349 private static Implementation codecEquals(final ImmutableMap<StackManipulation, Method> properties) {
350 // Label for 'return false;'
351 final Label falseLabel = new Label();
352 // Condition for 'if (!...)'
353 final StackManipulation ifFalse = ByteBuddyUtils.ifEq(falseLabel);
355 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 6 + 5);
356 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
357 // if (!java.util.(Objects|Arrays).equals(getFoo(), other.getFoo())) {
360 manipulations.add(THIS);
361 manipulations.add(entry.getKey());
362 manipulations.add(FIRST_ARG_REF);
363 manipulations.add(entry.getKey());
364 manipulations.add(entry.getValue().getReturnType().isArray() ? ARRAYS_EQUALS : OBJECTS_EQUALS);
365 manipulations.add(ifFalse);
369 manipulations.add(IntegerConstant.ONE);
370 manipulations.add(MethodReturn.INTEGER);
372 manipulations.add(ByteBuddyUtils.markLabel(falseLabel));
373 manipulations.add(IntegerConstant.ZERO);
374 manipulations.add(MethodReturn.INTEGER);
376 return new Implementation.Simple(manipulations.toArray(new StackManipulation[0]));
379 private static Implementation codecFillToString(final ImmutableMap<StackManipulation, Method> properties) {
380 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 4 + 2);
381 // push 'return helper' to stack...
382 manipulations.add(FIRST_ARG_REF);
383 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
384 // .add("getFoo", getFoo())
385 manipulations.add(new TextConstant(entry.getValue().getName()));
386 manipulations.add(THIS);
387 manipulations.add(entry.getKey());
388 manipulations.add(HELPER_ADD);
390 // ... execute 'return helper'
391 manipulations.add(MethodReturn.REFERENCE);
393 return new Implementation.Simple(manipulations.toArray(new StackManipulation[0]));
396 private abstract static class AbstractMethodImplementation implements Implementation {
397 private static final Generic BB_HANDLE = TypeDefinition.Sort.describe(VarHandle.class);
398 private static final Generic BB_OBJECT = TypeDefinition.Sort.describe(Object.class);
399 private static final StackManipulation OBJECT_CLASS = ClassConstant.of(TypeDescription.OBJECT);
400 private static final StackManipulation LOOKUP = invokeMethod(MethodHandles.class, "lookup");
401 private static final StackManipulation FIND_VAR_HANDLE = invokeMethod(Lookup.class,
402 "findVarHandle", Class.class, String.class, Class.class);
404 static final int PRIV_CONST = Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC | Opcodes.ACC_FINAL
405 | Opcodes.ACC_SYNTHETIC;
406 private static final int PRIV_VOLATILE = Opcodes.ACC_PRIVATE | Opcodes.ACC_VOLATILE | Opcodes.ACC_SYNTHETIC;
408 final TypeDescription retType;
410 final String methodName;
412 final String handleName;
414 AbstractMethodImplementation(final String methodName, final TypeDescription retType) {
415 this.methodName = requireNonNull(methodName);
416 this.retType = requireNonNull(retType);
417 this.handleName = methodName + "$$$V";
421 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
422 final InstrumentedType tmp = instrumentedType
423 // private static final VarHandle getFoo$$$V;
424 .withField(new FieldDescription.Token(handleName, PRIV_CONST, BB_HANDLE))
425 // private volatile Object getFoo;
426 .withField(new FieldDescription.Token(methodName, PRIV_VOLATILE, BB_OBJECT));
428 return tmp.withInitializer(new ByteCodeAppender.Simple(
429 // TODO: acquiring lookup is expensive, we should share it across all initialization
430 // getFoo$$$V = MethodHandles.lookup().findVarHandle(This.class, "getFoo", Object.class);
432 ClassConstant.of(tmp),
433 new TextConstant(methodName),
436 putField(tmp, handleName)));
440 private static final class KeyMethodImplementation extends AbstractMethodImplementation {
441 private static final StackManipulation CODEC_KEY = invokeMethod(CodecDataObject.class,
442 "codecKey", VarHandle.class);
444 KeyMethodImplementation(final String methodName, final TypeDescription retType) {
445 super(methodName, retType);
449 public ByteCodeAppender appender(final Target implementationTarget) {
450 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
451 return new ByteCodeAppender.Simple(
452 // return (FooType) codecKey(getFoo$$$V);
454 getField(instrumentedType, handleName),
456 TypeCasting.to(retType),
457 MethodReturn.REFERENCE);
462 * A simple leaf method, which looks up child by a String constant. This is slightly more complicated because we
463 * want to make sure we are using the same String instance as the one stored in associated DataObjectCodecContext,
464 * so that during lookup we perform an identity check instead of comparing content -- speeding things up as well
465 * as minimizing footprint. Since that string is not guaranteed to be interned in the String Pool, we cannot rely
466 * on the constant pool entry to resolve to the same object.
468 private static final class SimpleGetterMethodImplementation extends AbstractMethodImplementation {
469 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
470 "codecMember", VarHandle.class, String.class);
471 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
472 "resolveLocalName", String.class);
473 private static final Generic BB_STRING = TypeDefinition.Sort.describe(String.class);
476 private final String stringName;
478 SimpleGetterMethodImplementation(final String methodName, final TypeDescription retType) {
479 super(methodName, retType);
480 this.stringName = methodName + "$$$S";
484 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
485 final InstrumentedType tmp = super.prepare(instrumentedType)
486 // private static final String getFoo$$$S;
487 .withField(new FieldDescription.Token(stringName, PRIV_CONST, BB_STRING));
489 return tmp.withInitializer(new ByteCodeAppender.Simple(
490 // getFoo$$$S = CodecDataObjectBridge.resolveString("getFoo");
491 new TextConstant(methodName),
493 putField(tmp, stringName)));
497 public ByteCodeAppender appender(final Target implementationTarget) {
498 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
499 return new ByteCodeAppender.Simple(
500 // return (FooType) codecMember(getFoo$$$V, getFoo$$$S);
502 getField(instrumentedType, handleName),
503 getField(instrumentedType, stringName),
505 TypeCasting.to(retType),
506 MethodReturn.REFERENCE);
510 private static final class StructuredGetterMethodImplementation extends AbstractMethodImplementation {
511 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
512 "codecMember", VarHandle.class, Class.class);
514 private final Class<?> bindingClass;
516 StructuredGetterMethodImplementation(final String methodName, final TypeDescription retType,
517 final Class<?> bindingClass) {
518 super(methodName, retType);
519 this.bindingClass = requireNonNull(bindingClass);
523 public ByteCodeAppender appender(final Target implementationTarget) {
524 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
525 return new ByteCodeAppender.Simple(
526 // return (FooType) codecMember(getFoo$$$V, FooType.class);
528 getField(instrumentedType, handleName),
529 ClassConstant.of(TypeDefinition.Sort.describe(bindingClass).asErasure()),
531 TypeCasting.to(retType),
532 MethodReturn.REFERENCE);
536 private static final class SupplierGetterMethodImplementation extends AbstractMethodImplementation {
537 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
538 "codecMember", VarHandle.class, NodeContextSupplier.class);
539 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
540 "resolveNodeContextSupplier", String.class);
541 private static final Generic BB_NCS = TypeDefinition.Sort.describe(NodeContextSupplier.class);
544 private final String contextName;
546 SupplierGetterMethodImplementation(final String methodName, final TypeDescription retType) {
547 super(methodName, retType);
548 contextName = methodName + "$$$C";
552 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
553 final InstrumentedType tmp = super.prepare(instrumentedType)
554 // private static final NodeContextSupplier getFoo$$$C;
555 .withField(new FieldDescription.Token(contextName, PRIV_CONST, BB_NCS));
557 return tmp.withInitializer(new ByteCodeAppender.Simple(
558 // getFoo$$$C = CodecDataObjectBridge.resolve("getFoo");
559 new TextConstant(methodName),
561 putField(tmp, contextName)));
565 public ByteCodeAppender appender(final Target implementationTarget) {
566 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
567 return new ByteCodeAppender.Simple(
568 // return (FooType) codecMember(getFoo$$$V, getFoo$$$C);
570 getField(instrumentedType, handleName),
571 getField(instrumentedType, contextName),
573 TypeCasting.to(retType),
574 MethodReturn.REFERENCE);
578 private static final class CodecHashCode implements ByteCodeAppender {
579 private static final StackManipulation THIRTY_ONE = IntegerConstant.forValue(31);
580 private static final StackManipulation LOAD_RESULT = MethodVariableAccess.INTEGER.loadFrom(1);
581 private static final StackManipulation STORE_RESULT = MethodVariableAccess.INTEGER.storeAt(1);
582 private static final StackManipulation ARRAYS_HASHCODE = invokeMethod(Arrays.class, "hashCode", byte[].class);
583 private static final StackManipulation OBJECTS_HASHCODE = invokeMethod(Objects.class, "hashCode", Object.class);
585 private final ImmutableMap<StackManipulation, Method> properties;
587 CodecHashCode(final ImmutableMap<StackManipulation, Method> properties) {
588 this.properties = requireNonNull(properties);
592 public Size apply(final MethodVisitor methodVisitor, final Context implementationContext,
593 final MethodDescription instrumentedMethod) {
594 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 8 + 4);
596 manipulations.add(IntegerConstant.ONE);
597 manipulations.add(STORE_RESULT);
599 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
600 // result = 31 * result + java.util.(Objects,Arrays).hashCode(getFoo());
601 manipulations.add(THIRTY_ONE);
602 manipulations.add(LOAD_RESULT);
603 manipulations.add(Multiplication.INTEGER);
604 manipulations.add(THIS);
605 manipulations.add(entry.getKey());
606 manipulations.add(entry.getValue().getReturnType().isArray() ? ARRAYS_HASHCODE : OBJECTS_HASHCODE);
607 manipulations.add(Addition.INTEGER);
608 manipulations.add(STORE_RESULT);
611 manipulations.add(LOAD_RESULT);
612 manipulations.add(MethodReturn.INTEGER);
614 StackManipulation.Size operandStackSize = new StackManipulation.Compound(manipulations)
615 .apply(methodVisitor, implementationContext);
616 return new Size(operandStackSize.getMaximalSize(), instrumentedMethod.getStackSize() + 1);