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 to the extent possible. In most cases (grouping-generated types) this
72 * involves one level of indirection, which is a safe approach. If we are dealing with a type generated outside of a
73 * grouping statement, though, we are guaranteed instantiation-invariance and hence can hard-wire to a runtime-constant
74 * {@link NodeContextSupplier} -- which provides significant boost to JITs ability to optimize code -- especially with
75 * inlining and constant propagation.
78 * The accessor mapping performance is critical due to users typically not taking care of storing the results acquired
79 * by an invocation, assuming the accessors are backed by a normal field -- which of course is not true, as the results
80 * are lazily computed.
83 * The design is such that for a particular structure like:
91 * we end up generating a class with the following layout:
93 * public final class Foo$$$codecImpl extends CodecDataObject implements Foo {
94 * private static final VarHandle getBar$$$V;
95 * private volatile Object getBar;
97 * public Foo$$$codecImpl(NormalizedNodeContainer data) {
101 * public Bar getBar() {
102 * return (Bar) codecMember(getBar$$$V, "bar");
108 * This strategy minimizes the bytecode footprint and follows the generally good idea of keeping common logic in a
109 * single place in a maintainable form. The glue code is extremely light (~6 instructions), which is beneficial on both
110 * sides of invocation:
111 * - generated method can readily be inlined into the caller
112 * - it forms a call site into which codeMember() can be inlined with VarHandle being constant
115 * The second point is important here, as it allows the invocation logic around VarHandle to completely disappear,
116 * becoming synonymous with operations on a field. Even though the field itself is declared as volatile, it is only ever
117 * accessed through helper method using VarHandles -- and those helpers are using relaxed field ordering
118 * of {@code getAcquire()}/{@code setRelease()} memory semantics.
121 * Furthermore there are distinct {@code codecMember} methods, each of which supports a different invocation style:
123 * <li>with {@code String}, which ends up looking up a {@link ValueNodeCodecContext}</li>
124 * <li>with {@code Class}, which ends up looking up a {@link DataContainerCodecContext}</li>
125 * <li>with {@code NodeContextSupplier}, which performs a direct load</li>
127 * The third mode of operation requires that the object being implemented is not defined in a {@code grouping}, because
128 * it welds the object to a particular namespace -- hence it trades namespace mobility for access speed.
131 * The sticky point here is the NodeContextSupplier, as it is a heap object which cannot normally be looked up from the
132 * static context in which the static class initializer operates -- so we need perform some sort of a trick here.
133 * Eventhough ByteBuddy provides facilities for bridging references to type fields, those facilities operate on volatile
134 * fields -- hence they do not quite work for us.
137 * Another alternative, which we used in Javassist-generated DataObjectSerializers, is to muck with the static field
138 * using reflection -- which works, but requires redefinition of Field.modifiers, which is something Java 9 complains
139 * about quite noisily.
142 * We take a different approach here, which takes advantage of the fact we are in control of both code generation (here)
143 * and class loading (in {@link CodecClassLoader}). The process is performed in four steps:
145 * <li>During code generation, the context fields are pointed towards
146 * {@link ClassGeneratorBridge#resolveNodeContextSupplier(String)} and
147 * {@link ClassGeneratorBridge#resolveKey(String)} methods, which are public and static, hence perfectly usable
148 * in the context of a class initializer.</li>
149 * <li>During class loading of generated byte code, the original instance of the generator is called to wrap the actual
150 * class loading operation. At this point the generator installs itself as the current generator for this thread via
151 * {@link ClassGeneratorBridge#setup(CodecDataObjectGenerator)} and allows the class to be loaded.
152 * <li>After the class has been loaded, but before the call returns, we will force the class to initialize, at which
153 * point the static invocations will be redirect to {@link #resolveNodeContextSupplier(String)} and
154 * {@link #resolveKey(String)} methods, thus initializing the fields to the intended constants.</li>
155 * <li>Before returning from the class loading call, the generator will detach itself via
156 * {@link ClassGeneratorBridge#tearDown(CodecDataObjectGenerator)}.</li>
160 * This strategy works due to close cooperation with the target ClassLoader, as the entire code generation and loading
161 * block runs with the class loading lock for this FQCN and the reference is not leaked until the process completes.
163 abstract class CodecDataObjectGenerator<T extends CodecDataObject<?>> implements ClassGenerator<T> {
164 // Not reusable definition: we can inline NodeContextSuppliers without a problem
165 // FIXME: 6.0.0: wire this implementation, which requires that BindingRuntimeTypes provides information about types
166 // being genenerated from within a grouping
167 private static final class Fixed<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
168 implements NodeContextSupplierProvider<T> {
169 private final ImmutableMap<Method, NodeContextSupplier> properties;
171 Fixed(final Builder<?> template, final ImmutableMap<Method, NodeContextSupplier> properties,
172 final @Nullable Method keyMethod) {
173 super(template, keyMethod);
174 this.properties = requireNonNull(properties);
178 Builder<T> generateGetters(final Builder<T> builder) {
179 Builder<T> tmp = builder;
180 for (Method method : properties.keySet()) {
181 LOG.trace("Generating for fixed method {}", method);
182 final String methodName = method.getName();
183 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
184 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
185 new SupplierGetterMethodImplementation(methodName, retType));
191 ArrayList<Method> getterMethods() {
192 return new ArrayList<>(properties.keySet());
196 public NodeContextSupplier resolveNodeContextSupplier(final String methodName) {
197 final Optional<Entry<Method, NodeContextSupplier>> found = properties.entrySet().stream()
198 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
199 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
200 return verifyNotNull(found.get().getValue());
204 // Reusable definition: we have to rely on context lookups
205 private static final class Reusable<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
206 implements LocalNameProvider<T> {
207 private final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties;
208 private final Map<Method, Class<?>> daoProperties;
210 Reusable(final Builder<?> template, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
211 final Map<Method, Class<?>> daoProperties, final @Nullable Method keyMethod) {
212 super(template, keyMethod);
213 this.simpleProperties = requireNonNull(simpleProperties);
214 this.daoProperties = requireNonNull(daoProperties);
218 Builder<T> generateGetters(final Builder<T> builder) {
219 Builder<T> tmp = builder;
220 for (Method method : simpleProperties.keySet()) {
221 LOG.trace("Generating for simple method {}", method);
222 final String methodName = method.getName();
223 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
224 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
225 new SimpleGetterMethodImplementation(methodName, retType));
227 for (Entry<Method, Class<?>> entry : daoProperties.entrySet()) {
228 final Method method = entry.getKey();
229 LOG.trace("Generating for structured method {}", method);
230 final String methodName = method.getName();
231 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
232 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
233 new StructuredGetterMethodImplementation(methodName, retType, entry.getValue()));
240 ArrayList<Method> getterMethods() {
241 final ArrayList<Method> ret = new ArrayList<>(simpleProperties.size() + daoProperties.size());
242 ret.addAll(simpleProperties.keySet());
243 ret.addAll(daoProperties.keySet());
248 public String resolveLocalName(final String methodName) {
249 final Optional<Entry<Method, ValueNodeCodecContext>> found = simpleProperties.entrySet().stream()
250 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
251 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
252 return found.get().getValue().getSchema().getQName().getLocalName();
256 private static final Logger LOG = LoggerFactory.getLogger(CodecDataObjectGenerator.class);
257 private static final Generic BB_BOOLEAN = TypeDefinition.Sort.describe(boolean.class);
258 private static final Generic BB_DATAOBJECT = TypeDefinition.Sort.describe(DataObject.class);
259 private static final Generic BB_HELPER = TypeDefinition.Sort.describe(ToStringHelper.class);
260 private static final Generic BB_INT = TypeDefinition.Sort.describe(int.class);
261 private static final Comparator<Method> METHOD_BY_ALPHABET = Comparator.comparing(Method::getName);
263 private static final StackManipulation ARRAYS_EQUALS = invokeMethod(Arrays.class, "equals",
264 byte[].class, byte[].class);
265 private static final StackManipulation OBJECTS_EQUALS = invokeMethod(Objects.class, "equals",
266 Object.class, Object.class);
267 private static final StackManipulation HELPER_ADD = invokeMethod(ToStringHelper.class, "add",
268 String.class, Object.class);
270 private static final StackManipulation FIRST_ARG_REF = MethodVariableAccess.REFERENCE.loadFrom(1);
272 private static final int PROT_FINAL = Opcodes.ACC_PROTECTED | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
273 private static final int PUB_FINAL = Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
275 private static final Builder<?> CDO;
276 private static final Builder<?> ACDO;
279 final ByteBuddy bb = new ByteBuddy();
280 CDO = bb.subclass(CodecDataObject.class).visit(ByteBuddyUtils.computeFrames());
281 ACDO = bb.subclass(AugmentableCodecDataObject.class).visit(ByteBuddyUtils.computeFrames());
284 private final Builder<?> template;
285 private final Method keyMethod;
287 CodecDataObjectGenerator(final Builder<?> template, final @Nullable Method keyMethod) {
288 this.template = requireNonNull(template);
289 this.keyMethod = keyMethod;
292 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generate(final CodecClassLoader loader,
293 final Class<D> bindingInterface, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
294 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
295 return loader.generateClass(bindingInterface, "codecImpl",
296 new Reusable<>(CDO, simpleProperties, daoProperties, keyMethod));
299 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generateAugmentable(
300 final CodecClassLoader loader, final Class<D> bindingInterface,
301 final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
302 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
303 return loader.generateClass(bindingInterface, "codecImpl",
304 new Reusable<>(ACDO, simpleProperties, daoProperties, keyMethod));
308 public final GeneratorResult<T> generateClass(final CodecClassLoader loeader, final String fqcn,
309 final Class<?> bindingInterface) {
310 LOG.trace("Generating class {}", fqcn);
312 @SuppressWarnings("unchecked")
313 Builder<T> builder = (Builder<T>) template.name(fqcn).implement(bindingInterface);
315 builder = generateGetters(builder);
317 if (keyMethod != null) {
318 LOG.trace("Generating for key {}", keyMethod);
319 final String methodName = keyMethod.getName();
320 final TypeDescription retType = TypeDescription.ForLoadedType.of(keyMethod.getReturnType());
321 builder = builder.defineMethod(methodName, retType, PUB_FINAL).intercept(
322 new KeyMethodImplementation(methodName, retType));
325 // Index all property methods, turning them into "getFoo()" invocations, retaining order. We will be using
326 // those invocations in each of the three methods. Note that we do not glue the invocations to 'this', as we
327 // will be invoking them on 'other' in codecEquals()
328 final ArrayList<Method> properties = getterMethods();
329 // Make sure properties are alpha-sorted
330 properties.sort(METHOD_BY_ALPHABET);
331 final ImmutableMap<StackManipulation, Method> methods = Maps.uniqueIndex(properties,
332 ByteBuddyUtils::invokeMethod);
335 return GeneratorResult.of(builder
336 // codecHashCode() ...
337 .defineMethod("codecHashCode", BB_INT, PROT_FINAL)
338 .intercept(new Implementation.Simple(new CodecHashCode(methods)))
339 // ... codecEquals() ...
340 .defineMethod("codecEquals", BB_BOOLEAN, PROT_FINAL).withParameter(BB_DATAOBJECT)
341 .intercept(codecEquals(methods))
342 // ... and codecFillToString() ...
343 .defineMethod("codecFillToString", BB_HELPER, PROT_FINAL).withParameter(BB_HELPER)
344 .intercept(codecFillToString(methods))
349 abstract Builder<T> generateGetters(Builder<T> builder);
351 abstract ArrayList<Method> getterMethods();
353 private static Implementation codecEquals(final ImmutableMap<StackManipulation, Method> properties) {
354 // Label for 'return false;'
355 final Label falseLabel = new Label();
356 // Condition for 'if (!...)'
357 final StackManipulation ifFalse = ByteBuddyUtils.ifEq(falseLabel);
359 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 6 + 5);
360 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
361 // if (!java.util.(Objects|Arrays).equals(getFoo(), other.getFoo())) {
364 manipulations.add(THIS);
365 manipulations.add(entry.getKey());
366 manipulations.add(FIRST_ARG_REF);
367 manipulations.add(entry.getKey());
368 manipulations.add(entry.getValue().getReturnType().isArray() ? ARRAYS_EQUALS : OBJECTS_EQUALS);
369 manipulations.add(ifFalse);
373 manipulations.add(IntegerConstant.ONE);
374 manipulations.add(MethodReturn.INTEGER);
376 manipulations.add(ByteBuddyUtils.markLabel(falseLabel));
377 manipulations.add(IntegerConstant.ZERO);
378 manipulations.add(MethodReturn.INTEGER);
380 return new Implementation.Simple(manipulations.toArray(new StackManipulation[0]));
383 private static Implementation codecFillToString(final ImmutableMap<StackManipulation, Method> properties) {
384 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 4 + 2);
385 // push 'return helper' to stack...
386 manipulations.add(FIRST_ARG_REF);
387 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
388 // .add("getFoo", getFoo())
389 manipulations.add(new TextConstant(entry.getValue().getName()));
390 manipulations.add(THIS);
391 manipulations.add(entry.getKey());
392 manipulations.add(HELPER_ADD);
394 // ... execute 'return helper'
395 manipulations.add(MethodReturn.REFERENCE);
397 return new Implementation.Simple(manipulations.toArray(new StackManipulation[0]));
400 private abstract static class AbstractMethodImplementation implements Implementation {
401 private static final Generic BB_HANDLE = TypeDefinition.Sort.describe(VarHandle.class);
402 private static final Generic BB_OBJECT = TypeDefinition.Sort.describe(Object.class);
403 private static final StackManipulation OBJECT_CLASS = ClassConstant.of(TypeDescription.OBJECT);
404 private static final StackManipulation LOOKUP = invokeMethod(MethodHandles.class, "lookup");
405 private static final StackManipulation FIND_VAR_HANDLE = invokeMethod(Lookup.class,
406 "findVarHandle", Class.class, String.class, Class.class);
408 static final int PRIV_CONST = Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC | Opcodes.ACC_FINAL
409 | Opcodes.ACC_SYNTHETIC;
410 private static final int PRIV_VOLATILE = Opcodes.ACC_PRIVATE | Opcodes.ACC_VOLATILE | Opcodes.ACC_SYNTHETIC;
412 final TypeDescription retType;
414 final String methodName;
416 final String handleName;
418 AbstractMethodImplementation(final String methodName, final TypeDescription retType) {
419 this.methodName = requireNonNull(methodName);
420 this.retType = requireNonNull(retType);
421 this.handleName = methodName + "$$$V";
425 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
426 final InstrumentedType tmp = instrumentedType
427 // private static final VarHandle getFoo$$$V;
428 .withField(new FieldDescription.Token(handleName, PRIV_CONST, BB_HANDLE))
429 // private volatile Object getFoo;
430 .withField(new FieldDescription.Token(methodName, PRIV_VOLATILE, BB_OBJECT));
432 return tmp.withInitializer(new ByteCodeAppender.Simple(
433 // TODO: acquiring lookup is expensive, we should share it across all initialization
434 // getFoo$$$V = MethodHandles.lookup().findVarHandle(This.class, "getFoo", Object.class);
436 ClassConstant.of(tmp),
437 new TextConstant(methodName),
440 putField(tmp, handleName)));
444 private static final class KeyMethodImplementation extends AbstractMethodImplementation {
445 private static final StackManipulation CODEC_KEY = invokeMethod(CodecDataObject.class,
446 "codecKey", VarHandle.class);
448 KeyMethodImplementation(final String methodName, final TypeDescription retType) {
449 super(methodName, retType);
453 public ByteCodeAppender appender(final Target implementationTarget) {
454 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
455 return new ByteCodeAppender.Simple(
456 // return (FooType) codecKey(getFoo$$$V);
458 getField(instrumentedType, handleName),
460 TypeCasting.to(retType),
461 MethodReturn.REFERENCE);
466 * A simple leaf method, which looks up child by a String constant. This is slightly more complicated because we
467 * want to make sure we are using the same String instance as the one stored in associated DataObjectCodecContext,
468 * so that during lookup we perform an identity check instead of comparing content -- speeding things up as well
469 * as minimizing footprint. Since that string is not guaranteed to be interned in the String Pool, we cannot rely
470 * on the constant pool entry to resolve to the same object.
472 private static final class SimpleGetterMethodImplementation extends AbstractMethodImplementation {
473 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
474 "codecMember", VarHandle.class, String.class);
475 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
476 "resolveLocalName", String.class);
477 private static final Generic BB_STRING = TypeDefinition.Sort.describe(String.class);
480 private final String stringName;
482 SimpleGetterMethodImplementation(final String methodName, final TypeDescription retType) {
483 super(methodName, retType);
484 this.stringName = methodName + "$$$S";
488 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
489 final InstrumentedType tmp = super.prepare(instrumentedType)
490 // private static final String getFoo$$$S;
491 .withField(new FieldDescription.Token(stringName, PRIV_CONST, BB_STRING));
493 return tmp.withInitializer(new ByteCodeAppender.Simple(
494 // getFoo$$$S = CodecDataObjectBridge.resolveString("getFoo");
495 new TextConstant(methodName),
497 putField(tmp, stringName)));
501 public ByteCodeAppender appender(final Target implementationTarget) {
502 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
503 return new ByteCodeAppender.Simple(
504 // return (FooType) codecMember(getFoo$$$V, getFoo$$$S);
506 getField(instrumentedType, handleName),
507 getField(instrumentedType, stringName),
509 TypeCasting.to(retType),
510 MethodReturn.REFERENCE);
514 private static final class StructuredGetterMethodImplementation extends AbstractMethodImplementation {
515 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
516 "codecMember", VarHandle.class, Class.class);
518 private final Class<?> bindingClass;
520 StructuredGetterMethodImplementation(final String methodName, final TypeDescription retType,
521 final Class<?> bindingClass) {
522 super(methodName, retType);
523 this.bindingClass = requireNonNull(bindingClass);
527 public ByteCodeAppender appender(final Target implementationTarget) {
528 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
529 return new ByteCodeAppender.Simple(
530 // return (FooType) codecMember(getFoo$$$V, FooType.class);
532 getField(instrumentedType, handleName),
533 ClassConstant.of(TypeDefinition.Sort.describe(bindingClass).asErasure()),
535 TypeCasting.to(retType),
536 MethodReturn.REFERENCE);
540 private static final class SupplierGetterMethodImplementation extends AbstractMethodImplementation {
541 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
542 "codecMember", VarHandle.class, NodeContextSupplier.class);
543 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
544 "resolveNodeContextSupplier", String.class);
545 private static final Generic BB_NCS = TypeDefinition.Sort.describe(NodeContextSupplier.class);
548 private final String contextName;
550 SupplierGetterMethodImplementation(final String methodName, final TypeDescription retType) {
551 super(methodName, retType);
552 contextName = methodName + "$$$C";
556 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
557 final InstrumentedType tmp = super.prepare(instrumentedType)
558 // private static final NodeContextSupplier getFoo$$$C;
559 .withField(new FieldDescription.Token(contextName, PRIV_CONST, BB_NCS));
561 return tmp.withInitializer(new ByteCodeAppender.Simple(
562 // getFoo$$$C = CodecDataObjectBridge.resolve("getFoo");
563 new TextConstant(methodName),
565 putField(tmp, contextName)));
569 public ByteCodeAppender appender(final Target implementationTarget) {
570 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
571 return new ByteCodeAppender.Simple(
572 // return (FooType) codecMember(getFoo$$$V, getFoo$$$C);
574 getField(instrumentedType, handleName),
575 getField(instrumentedType, contextName),
577 TypeCasting.to(retType),
578 MethodReturn.REFERENCE);
582 private static final class CodecHashCode implements ByteCodeAppender {
583 private static final StackManipulation THIRTY_ONE = IntegerConstant.forValue(31);
584 private static final StackManipulation LOAD_RESULT = MethodVariableAccess.INTEGER.loadFrom(1);
585 private static final StackManipulation STORE_RESULT = MethodVariableAccess.INTEGER.storeAt(1);
586 private static final StackManipulation ARRAYS_HASHCODE = invokeMethod(Arrays.class, "hashCode", byte[].class);
587 private static final StackManipulation OBJECTS_HASHCODE = invokeMethod(Objects.class, "hashCode", Object.class);
589 private final ImmutableMap<StackManipulation, Method> properties;
591 CodecHashCode(final ImmutableMap<StackManipulation, Method> properties) {
592 this.properties = requireNonNull(properties);
596 public Size apply(final MethodVisitor methodVisitor, final Context implementationContext,
597 final MethodDescription instrumentedMethod) {
598 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 8 + 4);
600 manipulations.add(IntegerConstant.ONE);
601 manipulations.add(STORE_RESULT);
603 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
604 // result = 31 * result + java.util.(Objects,Arrays).hashCode(getFoo());
605 manipulations.add(THIRTY_ONE);
606 manipulations.add(LOAD_RESULT);
607 manipulations.add(Multiplication.INTEGER);
608 manipulations.add(THIS);
609 manipulations.add(entry.getKey());
610 manipulations.add(entry.getValue().getReturnType().isArray() ? ARRAYS_HASHCODE : OBJECTS_HASHCODE);
611 manipulations.add(Addition.INTEGER);
612 manipulations.add(STORE_RESULT);
615 manipulations.add(LOAD_RESULT);
616 manipulations.add(MethodReturn.INTEGER);
618 StackManipulation.Size operandStackSize = new StackManipulation.Compound(manipulations)
619 .apply(methodVisitor, implementationContext);
620 return new Size(operandStackSize.getMaximalSize(), instrumentedMethod.getStackSize() + 1);