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.codegen.state.GenerationState;
027    import org.jetbrains.jet.lang.psi.JetExpression;
028    
029    import java.util.List;
030    
031    import static org.jetbrains.jet.codegen.AsmUtil.comparisonOperandType;
032    
033    public 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    }