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| 1 | +/* |
| 2 | + * Copyright 2015 Alexey Andreev. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | +package org.teavm.classlib.java.lang.reflect; |
| 17 | + |
| 18 | +import java.util.ArrayList; |
| 19 | +import java.util.List; |
| 20 | +import org.teavm.dependency.AbstractDependencyListener; |
| 21 | +import org.teavm.dependency.DependencyAgent; |
| 22 | +import org.teavm.dependency.MethodDependency; |
| 23 | +import org.teavm.model.AccessLevel; |
| 24 | +import org.teavm.model.ClassHierarchy; |
| 25 | +import org.teavm.model.ClassHolder; |
| 26 | +import org.teavm.model.ClassReader; |
| 27 | +import org.teavm.model.ElementModifier; |
| 28 | +import org.teavm.model.FieldHolder; |
| 29 | +import org.teavm.model.MethodHolder; |
| 30 | +import org.teavm.model.MethodReader; |
| 31 | +import org.teavm.model.ValueType; |
| 32 | +import org.teavm.model.emit.ProgramEmitter; |
| 33 | +import org.teavm.model.emit.ValueEmitter; |
| 34 | + |
| 35 | +public abstract class BaseAnnotationDependencyListener extends AbstractDependencyListener { |
| 36 | + public static final String ANNOTATION_IMPLEMENTOR_SUFFIX = "$$_impl"; |
| 37 | + private static final ValueType ENUM_TYPE = ValueType.parse(Enum.class); |
| 38 | + private boolean enumsAsInts; |
| 39 | + |
| 40 | + public BaseAnnotationDependencyListener(boolean enumsAsInts) { |
| 41 | + this.enumsAsInts = enumsAsInts; |
| 42 | + } |
| 43 | + |
| 44 | + @Override |
| 45 | + public void methodReached(DependencyAgent agent, MethodDependency method) { |
| 46 | + ValueType type = method.getMethod().getResultType(); |
| 47 | + while (type instanceof ValueType.Array) { |
| 48 | + type = ((ValueType.Array) type).getItemType(); |
| 49 | + } |
| 50 | + if (type instanceof ValueType.Object) { |
| 51 | + String className = ((ValueType.Object) type).getClassName(); |
| 52 | + ClassReader cls = agent.getClassSource().get(className); |
| 53 | + if (cls != null && cls.hasModifier(ElementModifier.ANNOTATION)) { |
| 54 | + agent.linkClass(className); |
| 55 | + } |
| 56 | + } |
| 57 | + } |
| 58 | + |
| 59 | + protected final String getAnnotationImplementor(DependencyAgent agent, String annotationType) { |
| 60 | + String implementorName = annotationType + ANNOTATION_IMPLEMENTOR_SUFFIX; |
| 61 | + if (agent.getClassSource().get(implementorName) == null) { |
| 62 | + ClassHolder implementor = createImplementor(agent.getClassHierarchy(), annotationType, implementorName); |
| 63 | + agent.submitClass(implementor); |
| 64 | + } |
| 65 | + return implementorName; |
| 66 | + } |
| 67 | + |
| 68 | + private ClassHolder createImplementor(ClassHierarchy hierarchy, String annotationType, String implementorName) { |
| 69 | + ClassHolder implementor = new ClassHolder(implementorName); |
| 70 | + implementor.setParent("java.lang.Object"); |
| 71 | + implementor.getInterfaces().add(annotationType); |
| 72 | + implementor.getModifiers().add(ElementModifier.FINAL); |
| 73 | + implementor.setLevel(AccessLevel.PUBLIC); |
| 74 | + |
| 75 | + ClassReader annotation = hierarchy.getClassSource().get(annotationType); |
| 76 | + if (annotation == null) { |
| 77 | + return implementor; |
| 78 | + } |
| 79 | + |
| 80 | + List<ValueType> ctorSignature = new ArrayList<>(); |
| 81 | + for (MethodReader methodDecl : annotation.getMethods()) { |
| 82 | + if (methodDecl.hasModifier(ElementModifier.STATIC)) { |
| 83 | + continue; |
| 84 | + } |
| 85 | + FieldHolder field = new FieldHolder("$" + methodDecl.getName()); |
| 86 | + var type = methodDecl.getResultType(); |
| 87 | + var isEnum = false; |
| 88 | + if (enumsAsInts && hierarchy.isSuperType(ENUM_TYPE, type, false)) { |
| 89 | + type = ValueType.INTEGER; |
| 90 | + isEnum = true; |
| 91 | + } |
| 92 | + field.setType(type); |
| 93 | + field.setLevel(AccessLevel.PRIVATE); |
| 94 | + implementor.addField(field); |
| 95 | + |
| 96 | + MethodHolder accessor = new MethodHolder(methodDecl.getDescriptor()); |
| 97 | + ProgramEmitter pe = ProgramEmitter.create(accessor, hierarchy); |
| 98 | + ValueEmitter thisVal = pe.var(0, implementor); |
| 99 | + if (isEnum) { |
| 100 | + var cacheField = new FieldHolder("enumCache$" + field.getName()); |
| 101 | + cacheField.setLevel(AccessLevel.PRIVATE); |
| 102 | + cacheField.getModifiers().add(ElementModifier.STATIC); |
| 103 | + implementor.addField(cacheField); |
| 104 | + |
| 105 | + cacheField.setType(ValueType.arrayOf(methodDecl.getResultType())); |
| 106 | + var enumType = ((ValueType.Object) methodDecl.getResultType()).getClassName(); |
| 107 | + pe.when(pe.getField(cacheField.getReference(), cacheField.getType()).isNull()).thenDo(() -> { |
| 108 | + pe.setField(cacheField.getReference(), pe.invoke(enumType, "values", cacheField.getType())); |
| 109 | + }); |
| 110 | + var result = thisVal.getField(field.getName(), field.getType()); |
| 111 | + pe.getField(cacheField.getReference(), cacheField.getType()).getElement(result).returnValue(); |
| 112 | + } else { |
| 113 | + ValueEmitter result = thisVal.getField(field.getName(), field.getType()); |
| 114 | + if (field.getType() instanceof ValueType.Array) { |
| 115 | + result = result.cloneArray(); |
| 116 | + result = result.cast(field.getType()); |
| 117 | + } |
| 118 | + result.returnValue(); |
| 119 | + } |
| 120 | + implementor.addMethod(accessor); |
| 121 | + |
| 122 | + ctorSignature.add(field.getType()); |
| 123 | + } |
| 124 | + ctorSignature.add(ValueType.VOID); |
| 125 | + |
| 126 | + MethodHolder ctor = new MethodHolder("<init>", ctorSignature.toArray(new ValueType[0])); |
| 127 | + ProgramEmitter pe = ProgramEmitter.create(ctor, hierarchy); |
| 128 | + ValueEmitter thisVar = pe.var(0, implementor); |
| 129 | + thisVar.invokeSpecial(Object.class, "<init>"); |
| 130 | + int index = 1; |
| 131 | + for (MethodReader methodDecl : annotation.getMethods()) { |
| 132 | + if (methodDecl.hasModifier(ElementModifier.STATIC)) { |
| 133 | + continue; |
| 134 | + } |
| 135 | + ValueEmitter param = pe.var(index++, methodDecl.getResultType()); |
| 136 | + thisVar.setField("$" + methodDecl.getName(), param); |
| 137 | + } |
| 138 | + pe.exit(); |
| 139 | + implementor.addMethod(ctor); |
| 140 | + |
| 141 | + MethodHolder annotTypeMethod = new MethodHolder("annotationType", ValueType.parse(Class.class)); |
| 142 | + pe = ProgramEmitter.create(annotTypeMethod, hierarchy); |
| 143 | + pe.constant(ValueType.object(annotationType)).returnValue(); |
| 144 | + implementor.addMethod(annotTypeMethod); |
| 145 | + |
| 146 | + return implementor; |
| 147 | + } |
| 148 | +} |
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