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.annotations.Nullable;
022import org.jetbrains.asm4.Type;
023import org.jetbrains.asm4.commons.InstructionAdapter;
024import org.jetbrains.jet.codegen.ExpressionCodegen;
025import org.jetbrains.jet.codegen.StackValue;
026import org.jetbrains.jet.codegen.state.GenerationState;
027import org.jetbrains.jet.lang.psi.JetExpression;
028
029import java.util.List;
030
031import static org.jetbrains.jet.codegen.AsmUtil.comparisonOperandType;
032
033public class CompareTo implements IntrinsicMethod {
034    @Override
035    public StackValue generate(
036            ExpressionCodegen codegen,
037            InstructionAdapter v,
038            @NotNull Type expectedType,
039            @Nullable PsiElement element,
040            @Nullable List<JetExpression> arguments,
041            StackValue receiver,
042            @NotNull GenerationState state
043    ) {
044        JetExpression argument;
045        assert arguments != null;
046        if (arguments.size() == 1) {
047            argument = arguments.get(0);
048        }
049        else if (arguments.size() == 2) {
050            receiver = codegen.gen(arguments.get(0));
051            argument = arguments.get(1);
052        }
053        else {
054            throw new IllegalStateException("Invalid arguments to compareTo: " + arguments);
055        }
056        Type type = comparisonOperandType(receiver.type, codegen.expressionType(argument));
057
058        receiver.put(type, v);
059        codegen.gen(argument, type);
060
061        if (type == Type.BYTE_TYPE || type == Type.SHORT_TYPE || type == Type.CHAR_TYPE) {
062            v.sub(Type.INT_TYPE);
063        }
064        else if (type == Type.INT_TYPE) {
065            v.invokestatic("jet/runtime/Intrinsics", "compare", "(II)I");
066        }
067        else if (type == Type.LONG_TYPE) {
068            v.invokestatic("jet/runtime/Intrinsics", "compare", "(JJ)I");
069        }
070        else if (type == Type.FLOAT_TYPE) {
071            v.invokestatic("java/lang/Float", "compare", "(FF)I");
072        }
073        else if (type == Type.DOUBLE_TYPE) {
074            v.invokestatic("java/lang/Double", "compare", "(DD)I");
075        }
076        else {
077            throw new UnsupportedOperationException();
078        }
079        return StackValue.onStack(Type.INT_TYPE);
080    }
081}