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
017package org.jetbrains.jet.codegen.intrinsics;
018
019import com.intellij.psi.PsiElement;
020import org.jetbrains.annotations.NotNull;
021import org.jetbrains.asm4.Type;
022import org.jetbrains.asm4.commons.InstructionAdapter;
023import org.jetbrains.jet.codegen.ExpressionCodegen;
024import org.jetbrains.jet.codegen.StackValue;
025import org.jetbrains.jet.codegen.state.GenerationState;
026import org.jetbrains.jet.lang.psi.JetExpression;
027import org.jetbrains.jet.lang.resolve.java.AsmTypeConstants;
028
029import java.util.List;
030
031import static org.jetbrains.jet.codegen.AsmUtil.genInvokeAppendMethod;
032import static org.jetbrains.jet.codegen.AsmUtil.genStringBuilderConstructor;
033
034public class Concat implements IntrinsicMethod {
035    @Override
036    public StackValue generate(
037            ExpressionCodegen codegen,
038            InstructionAdapter v,
039            @NotNull Type expectedType,
040            PsiElement element,
041            List<JetExpression> arguments,
042            StackValue receiver,
043            @NotNull GenerationState state
044    ) {
045        if (receiver == null || receiver == StackValue.none()) {                                                     // LHS + RHS
046            genStringBuilderConstructor(v);
047            codegen.invokeAppend(arguments.get(0));                                // StringBuilder(LHS)
048            codegen.invokeAppend(arguments.get(1));
049        }
050        else {                                    // LHS.plus(RHS)
051            receiver.put(AsmTypeConstants.OBJECT_TYPE, v);
052            genStringBuilderConstructor(v);
053            v.swap();                                                              // StringBuilder LHS
054            genInvokeAppendMethod(v, expectedType);  // StringBuilder(LHS)
055            codegen.invokeAppend(arguments.get(0));
056        }
057
058        v.invokevirtual("java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
059        StackValue.onStack(AsmTypeConstants.JAVA_STRING_TYPE).put(expectedType, v);
060        return StackValue.onStack(expectedType);
061    }
062}