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.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 static org.jetbrains.jet.codegen.AsmUtil.NO_FLAG_PACKAGE_PRIVATE;
038 import static org.jetbrains.jet.codegen.AsmUtil.writeKotlinSyntheticClassAnnotation;
039 import static org.jetbrains.jet.lang.resolve.java.AsmTypeConstants.OBJECT_TYPE;
040 import static org.jetbrains.jet.lang.resolve.java.JvmAnnotationNames.KotlinSyntheticClass;
041 import static org.jetbrains.org.objectweb.asm.Opcodes.*;
042
043 public class SamWrapperCodegen {
044 private static final String FUNCTION_FIELD_NAME = "function";
045
046 private final GenerationState state;
047 private final JetTypeMapper typeMapper;
048 private final SamType samType;
049
050 public SamWrapperCodegen(@NotNull GenerationState state, @NotNull SamType samType) {
051 this.state = state;
052 this.typeMapper = state.getTypeMapper();
053 this.samType = samType;
054 }
055
056 public Type genWrapper(@NotNull JetFile file) {
057 // Name for generated class, in form of whatever$1
058 Type asmType = Type.getObjectType(getWrapperName(file));
059
060 // e.g. (T, T) -> Int
061 JetType functionType = samType.getKotlinFunctionType();
062 // e.g. compare(T, T)
063 SimpleFunctionDescriptor erasedInterfaceFunction = samType.getAbstractMethod().getOriginal();
064
065 ClassBuilder cv = state.getFactory().newVisitor(asmType, file);
066 cv.defineClass(file,
067 V1_6,
068 ACC_FINAL,
069 asmType.getInternalName(),
070 null,
071 OBJECT_TYPE.getInternalName(),
072 new String[]{ typeMapper.mapType(samType.getType()).getInternalName() }
073 );
074 cv.visitSource(file.getName(), null);
075
076 writeKotlinSyntheticClassAnnotation(cv, KotlinSyntheticClass.Kind.SAM_WRAPPER);
077
078 // e.g. ASM type for Function2
079 Type functionAsmType = typeMapper.mapType(functionType);
080
081 cv.newField(null,
082 ACC_SYNTHETIC | ACC_PRIVATE | ACC_FINAL,
083 FUNCTION_FIELD_NAME,
084 functionAsmType.getDescriptor(),
085 null,
086 null);
087
088 generateConstructor(asmType, functionAsmType, cv);
089 generateMethod(asmType, functionAsmType, cv, erasedInterfaceFunction, functionType);
090
091 cv.done();
092
093 return asmType;
094 }
095
096 private void generateConstructor(Type ownerType, Type functionType, ClassBuilder cv) {
097 MethodVisitor mv = cv.newMethod(null, NO_FLAG_PACKAGE_PRIVATE, "<init>", Type.getMethodDescriptor(Type.VOID_TYPE, functionType), null, null);
098
099 if (state.getClassBuilderMode() == ClassBuilderMode.FULL) {
100 mv.visitCode();
101 InstructionAdapter iv = new InstructionAdapter(mv);
102
103 // super constructor
104 iv.load(0, OBJECT_TYPE);
105 iv.invokespecial(OBJECT_TYPE.getInternalName(), "<init>", "()V");
106
107 // save parameter to field
108 iv.load(0, OBJECT_TYPE);
109 iv.load(1, functionType);
110 iv.putfield(ownerType.getInternalName(), FUNCTION_FIELD_NAME, functionType.getDescriptor());
111
112 iv.visitInsn(RETURN);
113 FunctionCodegen.endVisit(iv, "constructor of SAM wrapper", null);
114 }
115 }
116
117 private void generateMethod(
118 Type ownerType,
119 Type functionType,
120 ClassBuilder cv,
121 SimpleFunctionDescriptor erasedInterfaceFunction,
122 JetType functionJetType
123 ) {
124 // using static context to avoid creating ClassDescriptor and everything else
125 FunctionCodegen codegen = new FunctionCodegen(CodegenContext.STATIC, cv, state, null);
126
127 FunctionDescriptor invokeFunction = functionJetType.getMemberScope()
128 .getFunctions(Name.identifier("invoke")).iterator().next().getOriginal();
129 StackValue functionField = StackValue.field(functionType, ownerType, FUNCTION_FIELD_NAME, false);
130 codegen.genDelegate(erasedInterfaceFunction, invokeFunction, functionField);
131 }
132
133 @NotNull
134 private String getWrapperName(@NotNull JetFile containingFile) {
135 FqName packageClassFqName = PackageClassUtils.getPackageClassFqName(containingFile.getPackageFqName());
136 String packageInternalName = JvmClassName.byFqNameWithoutInnerClasses(packageClassFqName).getInternalName();
137 JavaClassDescriptor descriptor = samType.getJavaClassDescriptor();
138 return packageInternalName + "$sam$" + descriptor.getName().asString() + "$" +
139 Integer.toHexString(
140 JvmCodegenUtil.getPathHashCode(containingFile.getVirtualFile()) * 31 +
141 DescriptorUtils.getFqNameSafe(descriptor).hashCode()
142 );
143 }
144 }