001    /*
002     * Copyright 2010-2015 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.kotlin.codegen.intrinsics;
018    
019    import com.intellij.psi.PsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    import org.jetbrains.kotlin.codegen.ExpressionCodegen;
023    import org.jetbrains.kotlin.codegen.StackValue;
024    import org.jetbrains.kotlin.psi.JetExpression;
025    import org.jetbrains.org.objectweb.asm.Type;
026    
027    import java.util.List;
028    
029    import static org.jetbrains.kotlin.codegen.AsmUtil.isPrimitive;
030    
031    public class UnaryPlus extends LazyIntrinsicMethod {
032        @NotNull
033        @Override
034        public StackValue generateImpl(
035                @NotNull ExpressionCodegen codegen,
036                @NotNull Type returnType,
037                @Nullable PsiElement element,
038                @NotNull List<JetExpression> arguments,
039                @NotNull StackValue receiver
040        ) {
041            assert isPrimitive(returnType) : "Return type of UnaryPlus intrinsic should be of primitive type : " + returnType;
042    
043            if (receiver != StackValue.none()) {
044                return receiver;
045            }
046            else {
047                assert !arguments.isEmpty();
048                return codegen.gen(arguments.get(0));
049            }
050        }
051    }