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.ForLoadedType;
39 import net.bytebuddy.description.type.TypeDescription.Generic;
40 import net.bytebuddy.dynamic.DynamicType.Builder;
41 import net.bytebuddy.dynamic.scaffold.InstrumentedType;
42 import net.bytebuddy.implementation.Implementation;
43 import net.bytebuddy.implementation.Implementation.Context;
44 import net.bytebuddy.implementation.bytecode.Addition;
45 import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
46 import net.bytebuddy.implementation.bytecode.Multiplication;
47 import net.bytebuddy.implementation.bytecode.StackManipulation;
48 import net.bytebuddy.implementation.bytecode.assign.TypeCasting;
49 import net.bytebuddy.implementation.bytecode.constant.ClassConstant;
50 import net.bytebuddy.implementation.bytecode.constant.IntegerConstant;
51 import net.bytebuddy.implementation.bytecode.constant.TextConstant;
52 import net.bytebuddy.implementation.bytecode.member.MethodReturn;
53 import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
54 import net.bytebuddy.jar.asm.Label;
55 import net.bytebuddy.jar.asm.MethodVisitor;
56 import net.bytebuddy.jar.asm.Opcodes;
57 import org.eclipse.jdt.annotation.Nullable;
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 to the extent possible. In most cases (grouping-generated types) this
73 * involves one level of indirection, which is a safe approach. If we are dealing with a type generated outside of a
74 * grouping statement, though, we are guaranteed instantiation-invariance and hence can hard-wire to a runtime-constant
75 * {@link NodeContextSupplier} -- which provides significant boost to JITs ability to optimize code -- especially with
76 * inlining and constant propagation.
79 * The accessor mapping performance is critical due to users typically not taking care of storing the results acquired
80 * by an invocation, assuming the accessors are backed by a normal field -- which of course is not true, as the results
81 * are lazily computed.
84 * The design is such that for a particular structure like:
92 * we end up generating a class with the following layout:
94 * public final class Foo$$$codecImpl extends CodecDataObject implements Foo {
95 * private static final VarHandle getBar$$$V;
96 * private volatile Object getBar;
98 * public Foo$$$codecImpl(NormalizedNodeContainer data) {
102 * public Bar getBar() {
103 * return (Bar) codecMember(getBar$$$V, "bar");
109 * This strategy minimizes the bytecode footprint and follows the generally good idea of keeping common logic in a
110 * single place in a maintainable form. The glue code is extremely light (~6 instructions), which is beneficial on both
111 * sides of invocation:
113 * <li>generated method can readily be inlined into the caller</li>
114 * <li>it forms a call site into which codeMember() can be inlined with VarHandle being constant</li>
118 * The second point is important here, as it allows the invocation logic around VarHandle to completely disappear,
119 * becoming synonymous with operations on a field. Even though the field itself is declared as volatile, it is only ever
120 * accessed through helper method using VarHandles -- and those helpers are using relaxed field ordering
121 * of {@code getAcquire()}/{@code setRelease()} memory semantics.
124 * Furthermore there are distinct {@code codecMember} methods, each of which supports a different invocation style:
126 * <li>with {@code String}, which ends up looking up a {@link ValueNodeCodecContext}</li>
127 * <li>with {@code Class}, which ends up looking up a {@link DataContainerCodecContext}</li>
128 * <li>with {@code NodeContextSupplier}, which performs a direct load</li>
130 * The third mode of operation requires that the object being implemented is not defined in a {@code grouping}, because
131 * it welds the object to a particular namespace -- hence it trades namespace mobility for access speed.
134 * The sticky point here is the NodeContextSupplier, as it is a heap object which cannot normally be looked up from the
135 * static context in which the static class initializer operates -- so we need perform some sort of a trick here.
136 * Even though ByteBuddy provides facilities for bridging references to type fields, those facilities operate on
137 * volatile fields -- hence they do not quite work for us.
140 * Another alternative, which we used in Javassist-generated DataObjectSerializers, is to muck with the static field
141 * using reflection -- which works, but requires redefinition of Field.modifiers, which is something Java 9+ complains
142 * about quite noisily.
145 * We take a different approach here, which takes advantage of the fact we are in control of both code generation (here)
146 * and class loading (in {@link CodecClassLoader}). The process is performed in four steps:
148 * <li>During code generation, the context fields are pointed towards
149 * {@link ClassGeneratorBridge#resolveNodeContextSupplier(String)} and
150 * {@link ClassGeneratorBridge#resolveKey(String)} methods, which are public and static, hence perfectly usable
151 * in the context of a class initializer.</li>
152 * <li>During class loading of generated byte code, the original instance of the generator is called to wrap the actual
153 * class loading operation. At this point the generator installs itself as the current generator for this thread via
154 * {@link ClassGeneratorBridge#setup(CodecDataObjectGenerator)} and allows the class to be loaded.
155 * <li>After the class has been loaded, but before the call returns, we will force the class to initialize, at which
156 * point the static invocations will be redirected to {@link #resolveNodeContextSupplier(String)} and
157 * {@link #resolveKey(String)} methods, thus initializing the fields to the intended constants.</li>
158 * <li>Before returning from the class loading call, the generator will detach itself via
159 * {@link ClassGeneratorBridge#tearDown(CodecDataObjectGenerator)}.</li>
163 * This strategy works due to close cooperation with the target ClassLoader, as the entire code generation and loading
164 * block runs with the class loading lock for this FQCN and the reference is not leaked until the process completes.
166 abstract class CodecDataObjectGenerator<T extends CodecDataObject<?>> implements ClassGenerator<T> {
167 // Not reusable definition: we can inline NodeContextSuppliers without a problem
168 // FIXME: 6.0.0: wire this implementation, which requires that BindingRuntimeTypes provides information about types
169 // being generated from within a grouping
170 private static final class Fixed<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
171 implements NodeContextSupplierProvider<T> {
172 private final ImmutableMap<Method, NodeContextSupplier> properties;
174 Fixed(final TypeDescription superClass, final ImmutableMap<Method, NodeContextSupplier> properties,
175 final @Nullable Method keyMethod) {
176 super(superClass, keyMethod);
177 this.properties = requireNonNull(properties);
181 Builder<T> generateGetters(final Builder<T> builder) {
182 Builder<T> tmp = builder;
183 for (Method method : properties.keySet()) {
184 LOG.trace("Generating for fixed method {}", method);
185 final String methodName = method.getName();
186 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
187 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
188 new SupplierGetterMethodImplementation(methodName, retType));
194 ArrayList<Method> getterMethods() {
195 return new ArrayList<>(properties.keySet());
199 public NodeContextSupplier resolveNodeContextSupplier(final String methodName) {
200 final Optional<Entry<Method, NodeContextSupplier>> found = properties.entrySet().stream()
201 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
202 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
203 return verifyNotNull(found.get().getValue());
207 // Reusable definition: we have to rely on context lookups
208 private static final class Reusable<T extends CodecDataObject<?>> extends CodecDataObjectGenerator<T>
209 implements LocalNameProvider<T> {
210 private final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties;
211 private final Map<Method, Class<?>> daoProperties;
213 Reusable(final TypeDescription superClass, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
214 final Map<Method, Class<?>> daoProperties, final @Nullable Method keyMethod) {
215 super(superClass, keyMethod);
216 this.simpleProperties = requireNonNull(simpleProperties);
217 this.daoProperties = requireNonNull(daoProperties);
221 Builder<T> generateGetters(final Builder<T> builder) {
222 Builder<T> tmp = builder;
223 for (Method method : simpleProperties.keySet()) {
224 LOG.trace("Generating for simple 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 SimpleGetterMethodImplementation(methodName, retType));
230 for (Entry<Method, Class<?>> entry : daoProperties.entrySet()) {
231 final Method method = entry.getKey();
232 LOG.trace("Generating for structured method {}", method);
233 final String methodName = method.getName();
234 final TypeDescription retType = TypeDescription.ForLoadedType.of(method.getReturnType());
235 tmp = tmp.defineMethod(methodName, retType, PUB_FINAL).intercept(
236 new StructuredGetterMethodImplementation(methodName, retType, entry.getValue()));
243 ArrayList<Method> getterMethods() {
244 final ArrayList<Method> ret = new ArrayList<>(simpleProperties.size() + daoProperties.size());
245 ret.addAll(simpleProperties.keySet());
246 ret.addAll(daoProperties.keySet());
251 public String resolveLocalName(final String methodName) {
252 final Optional<Entry<Method, ValueNodeCodecContext>> found = simpleProperties.entrySet().stream()
253 .filter(entry -> methodName.equals(entry.getKey().getName())).findAny();
254 verify(found.isPresent(), "Failed to find property for %s in %s", methodName, this);
255 return found.get().getValue().getSchema().getQName().getLocalName();
259 private static final Logger LOG = LoggerFactory.getLogger(CodecDataObjectGenerator.class);
260 private static final Generic BB_BOOLEAN = TypeDefinition.Sort.describe(boolean.class);
261 private static final Generic BB_DATAOBJECT = TypeDefinition.Sort.describe(DataObject.class);
262 private static final Generic BB_HELPER = TypeDefinition.Sort.describe(ToStringHelper.class);
263 private static final Generic BB_INT = TypeDefinition.Sort.describe(int.class);
264 private static final TypeDescription BB_CDO = ForLoadedType.of(CodecDataObject.class);
265 private static final TypeDescription BB_ACDO = ForLoadedType.of(AugmentableCodecDataObject.class);
266 private static final Comparator<Method> METHOD_BY_ALPHABET = Comparator.comparing(Method::getName);
268 private static final StackManipulation ARRAYS_EQUALS = invokeMethod(Arrays.class, "equals",
269 byte[].class, byte[].class);
270 private static final StackManipulation OBJECTS_EQUALS = invokeMethod(Objects.class, "equals",
271 Object.class, Object.class);
272 private static final StackManipulation HELPER_ADD = invokeMethod(ToStringHelper.class, "add",
273 String.class, Object.class);
275 private static final StackManipulation FIRST_ARG_REF = MethodVariableAccess.REFERENCE.loadFrom(1);
277 private static final int PROT_FINAL = Opcodes.ACC_PROTECTED | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
278 private static final int PUB_FINAL = Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC;
280 private static final ByteBuddy BB = new ByteBuddy();
282 private final TypeDescription superClass;
283 private final Method keyMethod;
285 CodecDataObjectGenerator(final TypeDescription superClass, final @Nullable Method keyMethod) {
286 this.superClass = requireNonNull(superClass);
287 this.keyMethod = keyMethod;
290 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generate(final CodecClassLoader loader,
291 final Class<D> bindingInterface, final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
292 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
293 return loader.generateClass(bindingInterface, "codecImpl",
294 new Reusable<>(BB_CDO, simpleProperties, daoProperties, keyMethod));
297 static <D extends DataObject, T extends CodecDataObject<T>> Class<T> generateAugmentable(
298 final CodecClassLoader loader, final Class<D> bindingInterface,
299 final ImmutableMap<Method, ValueNodeCodecContext> simpleProperties,
300 final Map<Method, Class<?>> daoProperties, final Method keyMethod) {
301 return loader.generateClass(bindingInterface, "codecImpl",
302 new Reusable<>(BB_ACDO, simpleProperties, daoProperties, keyMethod));
306 public final GeneratorResult<T> generateClass(final CodecClassLoader loeader, final String fqcn,
307 final Class<?> bindingInterface) {
308 LOG.trace("Generating class {}", fqcn);
310 final Generic bindingDef = TypeDefinition.Sort.describe(bindingInterface);
311 @SuppressWarnings("unchecked")
312 Builder<T> builder = (Builder<T>) BB.subclass(Generic.Builder.parameterizedType(superClass, bindingDef).build())
313 .visit(ByteBuddyUtils.computeFrames()).name(fqcn).implement(bindingDef);
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$$$V = MethodHandles.lookup().findVarHandle(This.class, "getFoo", Object.class);
436 ClassConstant.of(tmp),
437 new TextConstant(methodName),
440 putField(tmp, handleName)));
444 private static final class KeyMethodImplementation extends AbstractMethodImplementation {
445 private static final StackManipulation CODEC_KEY = invokeMethod(CodecDataObject.class,
446 "codecKey", VarHandle.class);
448 KeyMethodImplementation(final String methodName, final TypeDescription retType) {
449 super(methodName, retType);
453 public ByteCodeAppender appender(final Target implementationTarget) {
454 return new ByteCodeAppender.Simple(
455 // return (FooType) codecKey(getFoo$$$V);
457 getField(implementationTarget.getInstrumentedType(), handleName),
459 TypeCasting.to(retType),
460 MethodReturn.REFERENCE);
465 * A simple leaf method, which looks up child by a String constant. This is slightly more complicated because we
466 * want to make sure we are using the same String instance as the one stored in associated DataObjectCodecContext,
467 * so that during lookup we perform an identity check instead of comparing content -- speeding things up as well
468 * as minimizing footprint. Since that string is not guaranteed to be interned in the String Pool, we cannot rely
469 * on the constant pool entry to resolve to the same object.
471 private static final class SimpleGetterMethodImplementation extends AbstractMethodImplementation {
472 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
473 "codecMember", VarHandle.class, String.class);
474 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
475 "resolveLocalName", String.class);
476 private static final Generic BB_STRING = TypeDefinition.Sort.describe(String.class);
479 private final String stringName;
481 SimpleGetterMethodImplementation(final String methodName, final TypeDescription retType) {
482 super(methodName, retType);
483 this.stringName = methodName + "$$$S";
487 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
488 final InstrumentedType tmp = super.prepare(instrumentedType)
489 // private static final String getFoo$$$S;
490 .withField(new FieldDescription.Token(stringName, PRIV_CONST, BB_STRING));
492 return tmp.withInitializer(new ByteCodeAppender.Simple(
493 // getFoo$$$S = CodecDataObjectBridge.resolveString("getFoo");
494 new TextConstant(methodName),
496 putField(tmp, stringName)));
500 public ByteCodeAppender appender(final Target implementationTarget) {
501 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
502 return new ByteCodeAppender.Simple(
503 // return (FooType) codecMember(getFoo$$$V, getFoo$$$S);
505 getField(instrumentedType, handleName),
506 getField(instrumentedType, stringName),
508 TypeCasting.to(retType),
509 MethodReturn.REFERENCE);
513 private static final class StructuredGetterMethodImplementation extends AbstractMethodImplementation {
514 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
515 "codecMember", VarHandle.class, Class.class);
517 private final Class<?> bindingClass;
519 StructuredGetterMethodImplementation(final String methodName, final TypeDescription retType,
520 final Class<?> bindingClass) {
521 super(methodName, retType);
522 this.bindingClass = requireNonNull(bindingClass);
526 public ByteCodeAppender appender(final Target implementationTarget) {
527 return new ByteCodeAppender.Simple(
528 // return (FooType) codecMember(getFoo$$$V, FooType.class);
530 getField(implementationTarget.getInstrumentedType(), handleName),
531 ClassConstant.of(TypeDefinition.Sort.describe(bindingClass).asErasure()),
533 TypeCasting.to(retType),
534 MethodReturn.REFERENCE);
538 private static final class SupplierGetterMethodImplementation extends AbstractMethodImplementation {
539 private static final StackManipulation CODEC_MEMBER = invokeMethod(CodecDataObject.class,
540 "codecMember", VarHandle.class, NodeContextSupplier.class);
541 private static final StackManipulation BRIDGE_RESOLVE = invokeMethod(ClassGeneratorBridge.class,
542 "resolveNodeContextSupplier", String.class);
543 private static final Generic BB_NCS = TypeDefinition.Sort.describe(NodeContextSupplier.class);
546 private final String contextName;
548 SupplierGetterMethodImplementation(final String methodName, final TypeDescription retType) {
549 super(methodName, retType);
550 contextName = methodName + "$$$C";
554 public InstrumentedType prepare(final InstrumentedType instrumentedType) {
555 final InstrumentedType tmp = super.prepare(instrumentedType)
556 // private static final NodeContextSupplier getFoo$$$C;
557 .withField(new FieldDescription.Token(contextName, PRIV_CONST, BB_NCS));
559 return tmp.withInitializer(new ByteCodeAppender.Simple(
560 // getFoo$$$C = CodecDataObjectBridge.resolve("getFoo");
561 new TextConstant(methodName),
563 putField(tmp, contextName)));
567 public ByteCodeAppender appender(final Target implementationTarget) {
568 final TypeDescription instrumentedType = implementationTarget.getInstrumentedType();
569 return new ByteCodeAppender.Simple(
570 // return (FooType) codecMember(getFoo$$$V, getFoo$$$C);
572 getField(instrumentedType, handleName),
573 getField(instrumentedType, contextName),
575 TypeCasting.to(retType),
576 MethodReturn.REFERENCE);
580 private static final class CodecHashCode implements ByteCodeAppender {
581 private static final StackManipulation THIRTY_ONE = IntegerConstant.forValue(31);
582 private static final StackManipulation LOAD_RESULT = MethodVariableAccess.INTEGER.loadFrom(1);
583 private static final StackManipulation STORE_RESULT = MethodVariableAccess.INTEGER.storeAt(1);
584 private static final StackManipulation ARRAYS_HASHCODE = invokeMethod(Arrays.class, "hashCode", byte[].class);
585 private static final StackManipulation OBJECTS_HASHCODE = invokeMethod(Objects.class, "hashCode", Object.class);
587 private final ImmutableMap<StackManipulation, Method> properties;
589 CodecHashCode(final ImmutableMap<StackManipulation, Method> properties) {
590 this.properties = requireNonNull(properties);
594 public Size apply(final MethodVisitor methodVisitor, final Context implementationContext,
595 final MethodDescription instrumentedMethod) {
596 final List<StackManipulation> manipulations = new ArrayList<>(properties.size() * 8 + 4);
598 manipulations.add(IntegerConstant.ONE);
599 manipulations.add(STORE_RESULT);
601 for (Entry<StackManipulation, Method> entry : properties.entrySet()) {
602 // result = 31 * result + java.util.(Objects,Arrays).hashCode(getFoo());
603 manipulations.add(THIRTY_ONE);
604 manipulations.add(LOAD_RESULT);
605 manipulations.add(Multiplication.INTEGER);
606 manipulations.add(THIS);
607 manipulations.add(entry.getKey());
608 manipulations.add(entry.getValue().getReturnType().isArray() ? ARRAYS_HASHCODE : OBJECTS_HASHCODE);
609 manipulations.add(Addition.INTEGER);
610 manipulations.add(STORE_RESULT);
613 manipulations.add(LOAD_RESULT);
614 manipulations.add(MethodReturn.INTEGER);
616 StackManipulation.Size operandStackSize = new StackManipulation.Compound(manipulations)
617 .apply(methodVisitor, implementationContext);
618 return new Size(operandStackSize.getMaximalSize(), instrumentedMethod.getStackSize() + 1);