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.intrinsics;
018    
019    import com.intellij.psi.PsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    import org.jetbrains.asm4.Type;
023    import org.jetbrains.asm4.commons.InstructionAdapter;
024    import org.jetbrains.jet.codegen.ExpressionCodegen;
025    import org.jetbrains.jet.codegen.StackValue;
026    import org.jetbrains.jet.lang.psi.JetExpression;
027    
028    import java.util.List;
029    
030    import static org.jetbrains.jet.codegen.AsmUtil.comparisonOperandType;
031    
032    public class CompareTo extends IntrinsicMethod {
033        @NotNull
034        @Override
035        public Type generateImpl(
036                @NotNull ExpressionCodegen codegen,
037                @NotNull InstructionAdapter v,
038                @NotNull Type returnType,
039                @Nullable PsiElement element,
040                @Nullable List<JetExpression> arguments,
041                StackValue receiver
042        ) {
043            JetExpression argument;
044            assert arguments != null;
045            if (arguments.size() == 1) {
046                argument = arguments.get(0);
047            }
048            else if (arguments.size() == 2) {
049                receiver = codegen.gen(arguments.get(0));
050                argument = arguments.get(1);
051            }
052            else {
053                throw new IllegalStateException("Invalid arguments to compareTo: " + arguments);
054            }
055            Type type = comparisonOperandType(receiver.type, codegen.expressionType(argument));
056    
057            receiver.put(type, v);
058            codegen.gen(argument, type);
059    
060            if (type == Type.INT_TYPE) {
061                v.invokestatic("kotlin/jvm/internal/Intrinsics", "compare", "(II)I");
062            }
063            else if (type == Type.LONG_TYPE) {
064                v.invokestatic("kotlin/jvm/internal/Intrinsics", "compare", "(JJ)I");
065            }
066            else if (type == Type.FLOAT_TYPE) {
067                v.invokestatic("java/lang/Float", "compare", "(FF)I");
068            }
069            else if (type == Type.DOUBLE_TYPE) {
070                v.invokestatic("java/lang/Double", "compare", "(DD)I");
071            }
072            else {
073                throw new UnsupportedOperationException();
074            }
075    
076            return Type.INT_TYPE;
077        }
078    }