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.FunctionDescriptor;
024 import org.jetbrains.jet.lang.descriptors.SimpleFunctionDescriptor;
025 import org.jetbrains.jet.lang.psi.JetFile;
026 import org.jetbrains.jet.lang.resolve.DescriptorUtils;
027 import org.jetbrains.jet.lang.resolve.java.JvmClassName;
028 import org.jetbrains.jet.lang.resolve.java.PackageClassUtils;
029 import org.jetbrains.jet.lang.resolve.java.descriptor.JavaClassDescriptor;
030 import org.jetbrains.jet.lang.resolve.java.sam.SingleAbstractMethodUtils;
031 import org.jetbrains.jet.lang.resolve.name.FqName;
032 import org.jetbrains.jet.lang.resolve.name.Name;
033 import org.jetbrains.jet.lang.types.JetType;
034 import org.jetbrains.org.objectweb.asm.MethodVisitor;
035 import org.jetbrains.org.objectweb.asm.Type;
036 import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter;
037
038 import static org.jetbrains.jet.codegen.AsmUtil.NO_FLAG_PACKAGE_PRIVATE;
039 import static org.jetbrains.jet.codegen.AsmUtil.writeKotlinSyntheticClassAnnotation;
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.org.objectweb.asm.Opcodes.*;
043
044 public class SamWrapperCodegen {
045 private static final String FUNCTION_FIELD_NAME = "function";
046
047 private final GenerationState state;
048 private final JetTypeMapper typeMapper;
049 private final JavaClassDescriptor samInterface;
050
051 public SamWrapperCodegen(@NotNull GenerationState state, @NotNull JavaClassDescriptor samInterface) {
052 this.state = state;
053 this.typeMapper = state.getTypeMapper();
054 this.samInterface = samInterface;
055 }
056
057 public Type genWrapper(@NotNull JetFile file) {
058 // Name for generated class, in form of whatever$1
059 Type asmType = Type.getObjectType(getWrapperName(file));
060
061 // e.g. (T, T) -> Int
062 JetType functionType = samInterface.getFunctionTypeForSamInterface();
063 assert functionType != null : samInterface.toString();
064 // e.g. compare(T, T)
065 SimpleFunctionDescriptor interfaceFunction = SingleAbstractMethodUtils.getAbstractMethodOfSamInterface(samInterface);
066
067 ClassBuilder cv = state.getFactory().newVisitor(asmType, file);
068 cv.defineClass(file,
069 V1_6,
070 ACC_FINAL,
071 asmType.getInternalName(),
072 null,
073 OBJECT_TYPE.getInternalName(),
074 new String[]{ typeMapper.mapType(samInterface).getInternalName() }
075 );
076 cv.visitSource(file.getName(), null);
077
078 writeKotlinSyntheticClassAnnotation(cv, KotlinSyntheticClass.Kind.SAM_WRAPPER);
079
080 // e.g. ASM type for Function2
081 Type functionAsmType = typeMapper.mapType(functionType);
082
083 cv.newField(null,
084 ACC_SYNTHETIC | ACC_PRIVATE | ACC_FINAL,
085 FUNCTION_FIELD_NAME,
086 functionAsmType.getDescriptor(),
087 null,
088 null);
089
090 generateConstructor(asmType, functionAsmType, cv);
091 generateMethod(asmType, functionAsmType, cv, interfaceFunction, functionType);
092
093 cv.done();
094
095 return asmType;
096 }
097
098 private void generateConstructor(Type ownerType, Type functionType, ClassBuilder cv) {
099 MethodVisitor mv = cv.newMethod(null, NO_FLAG_PACKAGE_PRIVATE, "<init>", Type.getMethodDescriptor(Type.VOID_TYPE, functionType), null, null);
100
101 if (state.getClassBuilderMode() == ClassBuilderMode.FULL) {
102 mv.visitCode();
103 InstructionAdapter iv = new InstructionAdapter(mv);
104
105 // super constructor
106 iv.load(0, OBJECT_TYPE);
107 iv.invokespecial(OBJECT_TYPE.getInternalName(), "<init>", "()V");
108
109 // save parameter to field
110 iv.load(0, OBJECT_TYPE);
111 iv.load(1, functionType);
112 iv.putfield(ownerType.getInternalName(), FUNCTION_FIELD_NAME, functionType.getDescriptor());
113
114 iv.visitInsn(RETURN);
115 FunctionCodegen.endVisit(iv, "constructor of SAM wrapper", null);
116 }
117 }
118
119 private void generateMethod(
120 Type ownerType,
121 Type functionType,
122 ClassBuilder cv,
123 SimpleFunctionDescriptor interfaceFunction,
124 JetType functionJetType
125 ) {
126 // using static context to avoid creating ClassDescriptor and everything else
127 FunctionCodegen codegen = new FunctionCodegen(CodegenContext.STATIC, cv, state, null);
128
129 FunctionDescriptor invokeFunction = functionJetType.getMemberScope()
130 .getFunctions(Name.identifier("invoke")).iterator().next().getOriginal();
131 StackValue functionField = StackValue.field(functionType, ownerType, FUNCTION_FIELD_NAME, false);
132 codegen.genDelegate(interfaceFunction, invokeFunction, functionField);
133 }
134
135 private String getWrapperName(@NotNull JetFile containingFile) {
136 FqName packageClassFqName = PackageClassUtils.getPackageClassFqName(containingFile.getPackageFqName());
137 String packageInternalName = JvmClassName.byFqNameWithoutInnerClasses(packageClassFqName).getInternalName();
138 return packageInternalName + "$sam$" + samInterface.getName().asString() + "$" +
139 Integer.toHexString(JvmCodegenUtil.getPathHashCode(containingFile.getVirtualFile()) * 31 + DescriptorUtils.getFqNameSafe(
140 samInterface).hashCode());
141 }
142 }