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.Opcodes;
023    import org.jetbrains.asm4.Type;
024    import org.jetbrains.asm4.commons.InstructionAdapter;
025    import org.jetbrains.jet.lang.resolve.java.AsmTypeConstants;
026    import org.jetbrains.jet.codegen.ExpressionCodegen;
027    import org.jetbrains.jet.codegen.StackValue;
028    import org.jetbrains.jet.codegen.state.GenerationState;
029    import org.jetbrains.jet.lang.psi.JetExpression;
030    
031    import java.util.List;
032    
033    public class HashCode 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            receiver.put(AsmTypeConstants.OBJECT_TYPE, v);
045            v.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "hashCode", "()I");
046            return StackValue.onStack(Type.INT_TYPE);
047        }
048    }