001 /*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package org.jetbrains.jet.codegen;
018
019 import org.jetbrains.annotations.NotNull;
020 import org.jetbrains.jet.codegen.context.CodegenContext;
021 import org.jetbrains.jet.codegen.state.GenerationState;
022 import org.jetbrains.jet.codegen.state.JetTypeMapper;
023 import org.jetbrains.jet.lang.descriptors.*;
024 import org.jetbrains.jet.lang.descriptors.impl.ClassDescriptorImpl;
025 import org.jetbrains.jet.lang.psi.JetFile;
026 import org.jetbrains.jet.lang.resolve.DescriptorUtils;
027 import org.jetbrains.jet.lang.resolve.java.PackageClassUtils;
028 import org.jetbrains.jet.lang.resolve.java.descriptor.JavaClassDescriptor;
029 import org.jetbrains.jet.lang.resolve.kotlin.PackagePartClassUtils;
030 import org.jetbrains.jet.lang.resolve.name.FqName;
031 import org.jetbrains.jet.lang.resolve.name.Name;
032 import org.jetbrains.jet.lang.types.JetType;
033 import org.jetbrains.org.objectweb.asm.MethodVisitor;
034 import org.jetbrains.org.objectweb.asm.Type;
035 import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter;
036
037 import java.util.Collections;
038
039 import static org.jetbrains.jet.codegen.AsmUtil.*;
040 import static org.jetbrains.jet.lang.resolve.java.AsmTypeConstants.OBJECT_TYPE;
041 import static org.jetbrains.jet.lang.resolve.java.JvmAnnotationNames.KotlinSyntheticClass;
042 import static org.jetbrains.jet.lang.resolve.java.diagnostics.DiagnosticsPackage.OtherOrigin;
043 import static org.jetbrains.org.objectweb.asm.Opcodes.*;
044
045 public class SamWrapperCodegen {
046 private static final String FUNCTION_FIELD_NAME = "function";
047
048 private final GenerationState state;
049 private final JetTypeMapper typeMapper;
050 private final SamType samType;
051 private final MemberCodegen<?> parentCodegen;
052
053 public SamWrapperCodegen(@NotNull GenerationState state, @NotNull SamType samType, @NotNull MemberCodegen<?> parentCodegen) {
054 this.state = state;
055 this.typeMapper = state.getTypeMapper();
056 this.samType = samType;
057 this.parentCodegen = parentCodegen;
058 }
059
060 public Type genWrapper(@NotNull JetFile file) {
061 // Name for generated class, in form of whatever$1
062 FqName fqName = getWrapperName(file);
063 Type asmType = asmTypeByFqNameWithoutInnerClasses(fqName);
064
065 // e.g. (T, T) -> Int
066 JetType functionType = samType.getKotlinFunctionType();
067
068 ClassDescriptor classDescriptor = new ClassDescriptorImpl(
069 samType.getJavaClassDescriptor().getContainingDeclaration(),
070 fqName.shortName(),
071 Modality.FINAL,
072 Collections.singleton(samType.getType()),
073 SourceElement.NO_SOURCE
074 );
075 // e.g. compare(T, T)
076 SimpleFunctionDescriptor erasedInterfaceFunction = samType.getAbstractMethod().getOriginal().copy(
077 classDescriptor,
078 Modality.FINAL,
079 Visibilities.PUBLIC,
080 CallableMemberDescriptor.Kind.SYNTHESIZED,
081 /*copyOverrides=*/ false
082 );
083
084 ClassBuilder cv = state.getFactory().newVisitor(OtherOrigin(erasedInterfaceFunction), asmType, file);
085 cv.defineClass(file,
086 V1_6,
087 ACC_FINAL,
088 asmType.getInternalName(),
089 null,
090 OBJECT_TYPE.getInternalName(),
091 new String[]{ typeMapper.mapType(samType.getType()).getInternalName() }
092 );
093 cv.visitSource(file.getName(), null);
094
095 writeKotlinSyntheticClassAnnotation(cv, KotlinSyntheticClass.Kind.SAM_WRAPPER);
096
097 // e.g. ASM type for Function2
098 Type functionAsmType = typeMapper.mapType(functionType);
099
100 cv.newField(OtherOrigin(erasedInterfaceFunction),
101 ACC_SYNTHETIC | ACC_PRIVATE | ACC_FINAL,
102 FUNCTION_FIELD_NAME,
103 functionAsmType.getDescriptor(),
104 null,
105 null);
106
107 generateConstructor(asmType, functionAsmType, cv);
108 generateMethod(asmType, functionAsmType, cv, erasedInterfaceFunction, functionType);
109
110 cv.done();
111
112 return asmType;
113 }
114
115 private void generateConstructor(Type ownerType, Type functionType, ClassBuilder cv) {
116 MethodVisitor mv = cv.newMethod(OtherOrigin(samType.getJavaClassDescriptor()),
117 NO_FLAG_PACKAGE_PRIVATE, "<init>", Type.getMethodDescriptor(Type.VOID_TYPE, functionType), null, null);
118
119 if (state.getClassBuilderMode() == ClassBuilderMode.FULL) {
120 mv.visitCode();
121 InstructionAdapter iv = new InstructionAdapter(mv);
122
123 // super constructor
124 iv.load(0, OBJECT_TYPE);
125 iv.invokespecial(OBJECT_TYPE.getInternalName(), "<init>", "()V", false);
126
127 // save parameter to field
128 iv.load(0, OBJECT_TYPE);
129 iv.load(1, functionType);
130 iv.putfield(ownerType.getInternalName(), FUNCTION_FIELD_NAME, functionType.getDescriptor());
131
132 iv.visitInsn(RETURN);
133 FunctionCodegen.endVisit(iv, "constructor of SAM wrapper", null);
134 }
135 }
136
137 private void generateMethod(
138 Type ownerType,
139 Type functionType,
140 ClassBuilder cv,
141 SimpleFunctionDescriptor erasedInterfaceFunction,
142 JetType functionJetType
143 ) {
144 // using static context to avoid creating ClassDescriptor and everything else
145 FunctionCodegen codegen = new FunctionCodegen(CodegenContext.STATIC.intoClass(
146 (ClassDescriptor) erasedInterfaceFunction.getContainingDeclaration(), OwnerKind.IMPLEMENTATION, state), cv, state, parentCodegen);
147
148 FunctionDescriptor invokeFunction = functionJetType.getMemberScope()
149 .getFunctions(Name.identifier("invoke")).iterator().next().getOriginal();
150 StackValue functionField = StackValue.field(functionType, ownerType, FUNCTION_FIELD_NAME, false);
151 codegen.genDelegate(erasedInterfaceFunction, invokeFunction, functionField);
152 }
153
154 @NotNull
155 private FqName getWrapperName(@NotNull JetFile containingFile) {
156 FqName packageClassFqName = PackageClassUtils.getPackageClassFqName(containingFile.getPackageFqName());
157 JavaClassDescriptor descriptor = samType.getJavaClassDescriptor();
158 String shortName = packageClassFqName.shortName().asString() + "$sam$" + descriptor.getName().asString() + "$" +
159 Integer.toHexString(
160 PackagePartClassUtils.getPathHashCode(containingFile.getVirtualFile()) * 31 +
161 DescriptorUtils.getFqNameSafe(descriptor).hashCode()
162 );
163 return packageClassFqName.parent().child(Name.identifier(shortName));
164 }
165 }